\u5b66\u7fd2\u3057\u305f\u70b9\u96fb\u8377\u306b\u3088\u308b\u96fb\u4f4d\u306b\u3064\u3044\u3066\uff0c\u554f\u984c\u3092\u901a\u3058\u3066\u5b9f\u969b\u306e\u6271\u3044\u65b9\u3092\u78ba\u8a8d\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
\n \n <\/i> \u4f8b\u984c\n <\/span>\n <\/p>\n\n \n \u6b21\u56f3\u306e\u901a\u308a\uff0c$x$\u8ef8\u4e0a\u306e\u539f\u70b9 $\\rmO$ \u306b $+q$ \u306e\u96fb\u8377 $\\rmA$ \u304c\uff0c$x=4$ \u306e\u4f4d\u7f6e\u306b $-4q$ \u306e\u96fb\u8377 $\\rmB$ \u304c\u7f6e\u304b\u308c\u3066\u3044\u308b\u3002\u30af\u30fc\u30ed\u30f3\u306e\u6cd5\u5247\u306e\u6bd4\u4f8b\u5b9a\u6570\u3092 $k$ \u3068\u3057\u3066\uff0c\u4ee5\u4e0b\u306e\u554f\u3044\u306b\u7b54\u3048\u3088\u3002\u305f\u3060\u3057\uff0c\u96fb\u4f4d\u304a\u3088\u3073\u4f4d\u7f6e\u30a8\u30cd\u30eb\u30ae\u30fc\u306e\u57fa\u6e96\u306f\u7121\u9650\u9060\u3068\u3059\u308b\u3002<\/p><\/p><\/noscript><\/figure><\/p><\/p>$x=2$ \u306e\u4f4d\u7f6e\u306b\u304a\u3051\u308b\uff0c\u96fb\u8377 $\\rmA$ \u306b\u3088\u308b\u96fb\u4f4d $V_1$ \u3092\u6c42\u3081\u3088\u3002<\/p><\/p>$x=2$ \u306e\u4f4d\u7f6e\u306e\u96fb\u4f4d $V$ \u3092\u6c42\u3081\uff0c\u3053\u306e\u4f4d\u7f6e\u306b $q$ \u306e\u96fb\u8377\u3092\u304a\u3044\u305f\u3068\u304d\u306b\u6301\u3064\u4f4d\u7f6e\u30a8\u30cd\u30eb\u30ae\u30fc\u3092\u6c42\u3081\u3088\u3002<\/p><\/p>$x$ \u8ef8\u4e0a\u306b\u304a\u3044\u3066\uff0c\u7121\u9650\u9060\u65b9\u4ee5\u5916\u3067\u96fb\u4f4d\u304c $0$ \u3068\u306a\u308b\u70b9\u3092\u6c42\u3081\u3088\u3002<\/p><\/p><\/p>\n <\/div>\n <\/div>\n\n\n\n(1) \u306e\u89e3\u304d\u65b9<\/h3>\n\n\n\n\u96fb\u5834\u306e\u554f\u984c\u3068\u7570\u306a\u308a\uff0c\u4eca\u56de\u306e\u554f\u984c\u3067\u554f\u308f\u308c\u3066\u3044\u308b\u306e\u306f\u300c\u96fb\u4f4d\u300d\u3067\u3042\u308a\uff0c\u5411\u304d\u304c\u306a\u3044\u70b9\u306b\u6ce8\u610f\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n\u307e\u305a\u306f (1) \u3067\u3059\u3002\u3053\u3061\u3089\u306f\u516c\u5f0f\u3092\u4f7f\u3046\u3060\u3051\u306e\u554f\u984c\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u539f\u70b9\u3068\u306e\u8ddd\u96e2\u304c $2$ \u306a\u306e\u3067\uff0c$$V_1=k\\bun{q}{2}$$\u3067\u3059\u306d\u3002<\/p>\n\n\n\n(2) \u306e\u89e3\u304d\u65b9<\/h3>\n\n\n\n<\/noscript>\u7fbd\u767d<\/div><\/div>\n\u7d9a\u3044\u3066 (2) \u3067\u3059\u3002<\/p>\n<\/div><\/div><\/div><\/div>\n\n\n\n$x=2$ \u306e\u4f4d\u7f6e\u306b\u304a\u3051\u308b\u96fb\u4f4d\u3092\u8003\u3048\u308b\u306b\u3042\u305f\u3063\u3066\u306f\uff0c$x=4$ \u306e\u4f4d\u7f6e\u306e\u96fb\u8377 $\\rmB$ \u306b\u3088\u308b\u96fb\u4f4d $V_2$ \u3082\u8003\u3048\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n$x=4$ \u304b\u3089\u306e\u8ddd\u96e2\u304c $4-2=2$ \u306a\u306e\u3067\uff0c$$V_2=k\\bun{-4q}{2}=-2kq$$\u3067\u3042\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u306d\u3002<\/p>\n\n\n\n\u6c42\u3081\u308b $V$ \u306f\uff0c$V_1$ \u3068 $V_2$ \u306e\u548c\u306a\u306e\u3067\uff0c$$V=V_1+V_2=-k\\bun{3q}{2}$$\u304c\u7b54\u3048\u3067\u3059\u3002<\/p>\n\n\n\n(3) \u306e\u89e3\u304d\u65b9<\/h3>\n\n\n\n\n(3) \u306f\u5c11\u3057\u96e3\u3057\u3044\u3067\u3059\u306d\u3002<\/p>\n<\/div><\/div><\/div><\/noscript>\u751f\u5f92<\/div><\/div><\/div>\n\n\n\n\u307e\u305a\uff0c\u96fb\u4f4d\u306e\u5f0f\u304c\u300c$k\\bun{Q}{r}$\u300d\u306e\u5f62\u3092\u3057\u3066\u3044\u308b\u305f\u3081\uff0c\u96fb\u8377\u306e\u5927\u304d\u3055\u304c\u5927\u304d\u3044\u307b\u3069\uff0c\u96fb\u8377\u304b\u3089\u306e\u8ddd\u96e2\u304c\u8fd1\u3044\u4f4d\u7f6e\u307b\u3069\uff0c\u96fb\u4f4d\u304c\u5927\u304d\u304f\u306a\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n\n\n\n\u672c\u554f\u3067\u306f\uff0c\u96fb\u8377 $\\rmB$ \u306e\u65b9\u304c\u5927\u304d\u3055\u304c\u5927\u304d\u306a\u96fb\u8377\u3092\u6301\u3063\u3066\u3044\u308b\u305f\u3081\uff0c\u300c\u96fb\u4f4d\u304c 0 \u306b\u306a\u308b\u306e\u306f\uff0c\u96fb\u8377 $\\rmB$ \u3088\u308a\u3082\u96fb\u8377 $\\rmA$ \u306b\u8fd1\u3044\u4f4d\u7f6e\u3067\u3042\u308b\u300d\u3068\u3044\u3046\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u306d\u3002<\/p>\n\n\n\n\u3053\u306e\u3088\u3046\u306a\u4f4d\u7f6e\u304c\u5b58\u5728\u3059\u308b\u306e\u306f\uff0c\u2460 $x<0$ \u3068\uff0c\u2461 $0<x<4$ \u306e\u9818\u57df\u306e2\u3064\u3067\u3059\u3002<\/p>\n\n\n\n<\/div>\n\n\n\n\u307e\u305f\uff0c\u4f4d\u7f6e $x$ \u3067\u306e\u96fb\u4f4d $V(x)$ \u306f\u96fb\u4f4d\u306e\u91cd\u306d\u5408\u308f\u305b\u3092\u8003\u3048\u308b\u3053\u3068\u3067\uff0c$$V(x)=k\\Bun{q}{|x|}-k\\bun{4q}{|4-x|}$$\u3067\u3042\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<\/noscript>\u7fbd\u767d<\/div><\/div>\n\u9818\u57df\u3054\u3068\u306b\u7d76\u5bfe\u5024\u3092\u5916\u3057\u306a\u304c\u3089\u8003\u3048\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/div><\/div><\/div><\/div>\n\n\n\n$x<0$ \u306e\u9818\u57df<\/strong><\/h3>\n\n\n\n$x<0$\uff0c$4-x>0$ \u306a\u306e\u3067\uff0c$V(x)=0$ \u3092\u8003\u3048\u3066\uff0c$$-\\bun{q}{x}-k\\bun{4q}{4-x}=0 \\qquad \\therefore \\quad x=-\\bun43$$<\/p>\n\n\n\n$0<x<4$ \u306e\u9818\u57df<\/h3>\n\n\n\n$x>0$\uff0c$4-x>0$ \u306a\u306e\u3067\uff0c$V(x)=0$ \u3092\u8003\u3048\u3066\uff0c$$\\bun{q}{x}-k\\bun{4q}{4-x}=0 \\qquad \\therefore \\quad x=\\bun45$$<\/p>\n\n\n\n<\/div>\n\n\n\n\u4ee5\u4e0a\u3092\u5408\u308f\u305b\u305f\uff0c$x=-\\Bun43,\\,\\bun45$ \u304c\u7b54\u3048\u3067\u3059\u3002<\/p>\n\n\n\n(3)\u306e\u8003\u3048\u65b9<\/h3>\n\n\n\n(3) \u3067\u306f\u5358\u7d14\u306b\uff0c$$k\\Bun{q}{|x|}-k\\bun{4q}{|4-x|}=0$$\u3068\u3044\u3046\u65b9\u7a0b\u5f0f\u3092\u89e3\u3044\u3066\u3082ok\u3067\u3059\u3002<\/p>\n\n\n\n\u4e0a\u306e\u89e3\u7b54\u306e\u3088\u3046\u306b\uff0c\u96fb\u4f4d\u306e\u5f0f\u3092\u5143\u306b\u8003\u3048\u308b\u9818\u57df\u3092\u7d5e\u308a\u8fbc\u3080\u3053\u3068\u304c\u3067\u304d\u308c\u3070\uff0c\u3088\u308a\u697d\u306b\u89e3\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u306d\u3002<\/p>\n\n\n\n\u96fb\u4f4d\u306e\u30b0\u30e9\u30d5\u306e\u8003\u5bdf<\/h2>\n\n\n\n\u4f8b\u984c\u3067\u306f\u96fb\u4f4d\u304c $0$ \u306b\u306a\u308b\u70b9\u306e\u307f\u3092\u6c42\u3081\u307e\u3057\u305f\u304c\uff0c\u300c\u4f4d\u7f6e $x$ \u306b\u304a\u3051\u308b\u96fb\u4f4d $V(x)$ \u306e\u30b0\u30e9\u30d5\u3092\u304b\u3051\u300d\u3068\u3044\u308f\u308c\u305f\u3089\u304b\u3051\u307e\u3059\u304b\u2026\uff1f<\/p>\n\n\n\n<\/noscript>\u7fbd\u767d<\/div><\/div>\n\u30b0\u30e9\u30d5\u306e\u6982\u5f62\u3092\u8003\u3048\u308b\u306b\u3042\u305f\u3063\u3066\u306f\u3044\u304f\u3064\u304b\u30dd\u30a4\u30f3\u30c8\u304c\u3042\u308a\u307e\u3059\u306e\u3067\uff0c\u9806\u756a\u306b\u78ba\u8a8d\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/div><\/div><\/div><\/div>\n\n\n\n\u30b0\u30e9\u30d5\u306e\u8db3\u3057\u5408\u308f\u305b<\/h3>\n\n\n\n$V(x)=k\\Bun{q}{|x|}-k\\bun{4q}{|4-x|}$ \u306e\u30b0\u30e9\u30d5\u3068\u3044\u308f\u308c\u308b\u3068\uff0c\u30d1\u30c3\u3068\u6982\u5f62\u3092\u601d\u3044\u6d6e\u304b\u3079\u308b\u306e\u306f\u96e3\u3057\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n$V(x)$ \u306f\u96fb\u8377 $\\rmA$ \u306b\u3088\u308b\u96fb\u4f4d $V_1(x)$ \u3068\u96fb\u8377 $\\rmB$ \u306b\u3088\u308b\u96fb\u4f4d $V_2(x)$ \u306e\u91cd\u306d\u5408\u308f\u305b\u3067\u3059\u306e\u3067\uff0c\u30b0\u30e9\u30d5\u306b\u95a2\u3057\u3066\u3082\u305d\u308c\u305e\u308c\u306e\u30b0\u30e9\u30d5\u306e\u8db3\u3057\u7b97\u3068\u3057\u3066\u8003\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n<\/noscript><\/figure>\n\n\n\n\u7279\u5b9a\u306e\u4f4d\u7f6e\u3067\u306e\u632f\u308b\u821e\u3044<\/h3>\n\n\n\n\u96fb\u8377 $\\rmA$ \u306e\u3054\u304f\u8fd1\u304f\u3067\u306f\u6b63\u306e\u7121\u9650\u5927\u306b\uff0c\u96fb\u8377 $\\rmB$ \u306e\u3054\u304f\u8fd1\u304f\u3067\u306f\u8ca0\u306e\u7121\u9650\u5927\u306b\u767a\u6563\u3057\u307e\u3059\u3002<\/p>\n\n\n\n\u307e\u305f\uff0c\u7121\u9650\u9060\u65b9\u3067\u306f\u96fb\u8377\u304b\u3089\u5341\u5206\u306b\u9060\u3056\u304b\u308b\u305f\u3081\uff0c\u96fb\u4f4d\u3082 $0$ \u3068\u306a\u308a\u307e\u3059\u306d\u3002<\/p>\n\n\n\n\u96fb\u4f4d\u304c $0$ \u3068\u306a\u308b\u4f4d\u7f6e<\/h3>\n\n\n\n\u96fb\u4f4d\u306e\u30b0\u30e9\u30d5\u306e\u50be\u304d\u306e $-1$ \u500d\u306f\u96fb\u5834\u3092\u8868\u3059\u306e\u3067\u3057\u305f\u3002\u3068\u3044\u3046\u3053\u3068\u306f\uff0c\u96fb\u5834\u304c $0$ \u306e\u4f4d\u7f6e\u3067\u306f\u96fb\u4f4d\u306e\u30b0\u30e9\u30d5\u306e\u50be\u304d\u3082 $0$ \u306b\u306a\u308a\u307e\u3059\u306d\u3002<\/p>\n\n\n\n\u4f8b\u984c\u3067\uff0c$x=-4$ \u306e\u4f4d\u7f6e\u306e\u96fb\u5834\u304c $0$ \u3068\u306a\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3057\u305f\u306e\u3067\uff0c$x=-4$ \u306e\u4f4d\u7f6e\u306b\u304a\u3051\u308b $V(x)$ \u306e\u30b0\u30e9\u30d5\u306e\u50be\u304d\u306f $0$ \u3067\u3059\uff01<\/p>\n\n\n\n\u30b0\u30e9\u30d5\u306e\u63cf\u753b<\/h3>\n\n\n\n\u4ee5\u4e0a\u3092\u8e0f\u307e\u3048\u3066\u30b0\u30e9\u30d5\u3092\u304b\u304f\u3068\uff0c\u56f3\u306e\u3088\u3046\u306a\u6982\u5f62\u304c\u5f97\u3089\u308c\u307e\u3059\u3002<\/p>\n\n\n<\/noscript><\/figure>\n\n\n\n\u30b0\u30e9\u30d5\u306e\u5f62\u81ea\u4f53\u306f\u8907\u96d1\u3067\u3059\u304c\uff0c3\u3064\u306e\u6027\u8cea\u306b\u6ce8\u76ee\u3059\u308b\u3053\u3068\u3067\uff0c\u5fae\u5206\u3059\u308b\u3053\u3068\u306a\u304f\u30b0\u30e9\u30d5\u306e\u6982\u5f62\u3092\u77e5\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u3059\u3002<\/p>\n\n\n\n<\/noscript>\u7fbd\u767d<\/div><\/div>\n\u3053\u308c\u3063\u3066\u51c4\u304f\u306a\u3044\u3067\u3059\u304b\u2026\uff1f<\/p>\n<\/div><\/div><\/div><\/div>\n\n\n\n\u305b\u3063\u304b\u304f\u30b0\u30e9\u30d5\u306e\u6982\u5f62\u3092\u304b\u3044\u305f\u306e\u3067\uff0c\u3053\u308c\u3092\u5229\u7528\u3057\u305f\u554f\u984c\u3092\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n \n \n \n \n <\/i> \u4f8b\u984c\n <\/span>\n <\/p>\n\n \n \u4e0a\u306e\u4f8b\u984c\u3067\u6271\u3063\u305f\u96fb\u4f4d\u3068\u540c\u3058\u3088\u3046\u306b\u96fb\u8377\u3092\u914d\u7f6e\u3059\u308b\u3002$x$ \u8ef8\u4e0a\u306e\u8ca0\u306e\u65b9\u5411\u306e\u7121\u9650\u9060\u65b9\u306b $+Q$ \u306e\u96fb\u8377\u3092\u305d\u3063\u3068\u304a\u3044\u305f\u3068\u304d\uff0c\u3053\u306e\u96fb\u8377\u306f\u3069\u306e\u3088\u3046\u306a\u904b\u52d5\u3092\u3059\u308b\u304b\u3002<\/p>\n <\/div>\n <\/div>\n\n\n\n\u89e3\u304d\u65b9<\/h3>\n\n\n\n\u96fb\u8377\u306e\u52d5\u304d\u3092\u8003\u3048\u308b\u969b\u306b\u306f\u300c\u96fb\u4f4d\u306e\u30b0\u30e9\u30d5\u3092\u5742\u9053\u3068\u3057\u3066\u8003\u3048\u308b\u3068\u4fbf\u5229\u300d\u3067\u3057\u305f\u3002<\/p>\n\n\n\n\u4eca\u56de\u306f\u8ca0\u306e\u7121\u9650\u9060\u65b9\u306b\u96fb\u8377\u3092\u914d\u7f6e\u3057\u3066\u3044\u307e\u3059\u304c\uff0c$x\\to-\\infty$ \u3067 $V(x)\\to0$ \u3067\u3059\u306e\u3067\uff0c\u9ad8\u3055 0 \u306e\u3068\u3053\u308d\u304b\u3089\u5742\u9053\u3092\u8ee2\u304c\u308a\u59cb\u3081\u307e\u3059\u3002<\/p>\n\n\n\n<\/div>\n\n\n\n\u901f\u3055\u304c\u6700\u5927\u306b\u306a\u308b\u306e\u306f\u8c37\u5e95\u306e\u90e8\u5206\u3067\u3059\u3002\u30b0\u30e9\u30d5\u306e\u6982\u5f62\u304b\u3089\uff0c$x=-4$ \u306e\u4f4d\u7f6e\u3060\u3068\u3059\u3050\u306b\u308f\u304b\u308a\u307e\u3059\u306d\u3002<\/p>\n\n\n\n\u96fb\u8377\u306e\u8cea\u91cf\u3092 $m$\uff0c$x=-4$ \u306e\u4f4d\u7f6e\u306b\u304a\u3051\u308b\u96fb\u8377\u306e\u901f\u3055\u3092 $v$ \u3068\u3059\u308c\u3070\uff0c\u30a8\u30cd\u30eb\u30ae\u30fc\u4fdd\u5b58\u5247\u3088\u308a\uff0c<\/p>\n\n\n\n$$0=\\bun12mv^2+\\left(k\\bun{Qq}{|-4|}-k\\bun{4Qq}{|-4-4|}\\right)$$<\/p>\n\n\n\n\u304c\u6210\u7acb\u3057\u307e\u3059\u3002\u3053\u308c\u3092\u89e3\u304f\u3053\u3068\u3067\uff0c<\/p>\n\n\n\n$$v=\\sqrt{\\bun{kQq}{2m}}$$<\/p>\n\n\n\n\u304c\u5f97\u3089\u308c\u307e\u3059\u306d\u3002<\/p>\n\n\n\n<\/div>\n\n\n\n$x=-4$ \u3092\u901a\u308a\u904e\u304e\u308b\u3068\uff0c\u96fb\u8377\u306f\u5742\u9053\u3092\u767b\u308a\u306f\u3058\u3081\u307e\u3059\u3002<\/p>\n\n\n\n\u767b\u308c\u308b\u9ad8\u3055\u306f\u30b9\u30bf\u30fc\u30c8\u5730\u70b9\u3068\u540c\u3058 $V(x)=0$ \u306e\u3068\u3053\u308d\u307e\u3067\u3067\u3059\u306e\u3067\uff0c$x=-\\bun43$ \u306e\u4f4d\u7f6e\u307e\u3067\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u306e\u70b9\u3067\u6298\u308a\u8fd4\u3057\u3066\uff0c\u518d\u3073 $x\\to-\\infty$ \u307e\u3067\u8ee2\u304c\u3063\u3066\u3044\u304f\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n\u25b6 \u96fb\u5834\u3068\u96fb\u4f4d\u30b7\u30ea\u30fc\u30ba\u306e\u5b66\u7fd2\u9806\u30ac\u30a4\u30c9\u30fb\u8981\u70b9\u6574\u7406\u306f\u3053\u3061\u3089<\/strong><\/p>\n\n\n\n\u96fb\u5834\u3068\u96fb\u4f4d\u306e\u307e\u3068\u3081\u3010\u5b66\u7fd2\u30ed\u30fc\u30c9\u30de\u30c3\u30d7\u3011<\/div>\u96fb\u5834\u3068\u96fb\u4f4d\u306e\u9055\u3044\u3068\u4f7f\u3044\u5206\u3051\u30fb\u70b9\u96fb\u8377\u306e\u5f0f\u30fb\u3064\u307e\u305a\u304d\u30dd\u30a4\u30f3\u30c8\u30921\u30da\u30fc\u30b8\u306b\u51dd\u7e2e\u3057\u305f\u5b66\u7fd2\u9806\u30ac\u30a4\u30c9\u3067\u3059\u3002<\/div>\u8a73\u3057\u304f\u898b\u308b<\/a><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"\u8907\u6570\u306e\u70b9\u96fb\u8377\u306b\u3088\u308b\u96fb\u4f4d\u3092\u30b0\u30e9\u30d5\u306e\u8db3\u3057\u5408\u308f\u305b\u3067\u6349\u3048\uff0c\u96fb\u4f4d\u304c0\u306b\u306a\u308b\u4f4d\u7f6e\u3092\u6c42\u3081\u308b\u554f\u984c\u3092\u6574\u7406\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"author":1,"featured_media":6735,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[39,23],"tags":[],"class_list":["post-6832","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-39","category-electromagnetics"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\n\t\t\n
\u6b21\u56f3\u306e\u901a\u308a\uff0c$x$\u8ef8\u4e0a\u306e\u539f\u70b9 $\\rmO$ \u306b $+q$ \u306e\u96fb\u8377 $\\rmA$ \u304c\uff0c$x=4$ \u306e\u4f4d\u7f6e\u306b $-4q$ \u306e\u96fb\u8377 $\\rmB$ \u304c\u7f6e\u304b\u308c\u3066\u3044\u308b\u3002\u30af\u30fc\u30ed\u30f3\u306e\u6cd5\u5247\u306e\u6bd4\u4f8b\u5b9a\u6570\u3092 $k$ \u3068\u3057\u3066\uff0c\u4ee5\u4e0b\u306e\u554f\u3044\u306b\u7b54\u3048\u3088\u3002\u305f\u3060\u3057\uff0c\u96fb\u4f4d\u304a\u3088\u3073\u4f4d\u7f6e\u30a8\u30cd\u30eb\u30ae\u30fc\u306e\u57fa\u6e96\u306f\u7121\u9650\u9060\u3068\u3059\u308b\u3002<\/p><\/p>
<\/noscript><\/figure><\/p><\/p>$x=2$ \u306e\u4f4d\u7f6e\u306b\u304a\u3051\u308b\uff0c\u96fb\u8377 $\\rmA$ \u306b\u3088\u308b\u96fb\u4f4d $V_1$ \u3092\u6c42\u3081\u3088\u3002<\/p><\/p>$x=2$ \u306e\u4f4d\u7f6e\u306e\u96fb\u4f4d $V$ \u3092\u6c42\u3081\uff0c\u3053\u306e\u4f4d\u7f6e\u306b $q$ \u306e\u96fb\u8377\u3092\u304a\u3044\u305f\u3068\u304d\u306b\u6301\u3064\u4f4d\u7f6e\u30a8\u30cd\u30eb\u30ae\u30fc\u3092\u6c42\u3081\u3088\u3002<\/p><\/p>$x$ \u8ef8\u4e0a\u306b\u304a\u3044\u3066\uff0c\u7121\u9650\u9060\u65b9\u4ee5\u5916\u3067\u96fb\u4f4d\u304c $0$ \u3068\u306a\u308b\u70b9\u3092\u6c42\u3081\u3088\u3002<\/p><\/p><\/p>\n <\/div>\n <\/div>\n\n\n\n(1) \u306e\u89e3\u304d\u65b9<\/h3>\n\n\n\n\u96fb\u5834\u306e\u554f\u984c\u3068\u7570\u306a\u308a\uff0c\u4eca\u56de\u306e\u554f\u984c\u3067\u554f\u308f\u308c\u3066\u3044\u308b\u306e\u306f\u300c\u96fb\u4f4d\u300d\u3067\u3042\u308a\uff0c\u5411\u304d\u304c\u306a\u3044\u70b9\u306b\u6ce8\u610f\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n\u307e\u305a\u306f (1) \u3067\u3059\u3002\u3053\u3061\u3089\u306f\u516c\u5f0f\u3092\u4f7f\u3046\u3060\u3051\u306e\u554f\u984c\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u539f\u70b9\u3068\u306e\u8ddd\u96e2\u304c $2$ \u306a\u306e\u3067\uff0c$$V_1=k\\bun{q}{2}$$\u3067\u3059\u306d\u3002<\/p>\n\n\n\n(2) \u306e\u89e3\u304d\u65b9<\/h3>\n\n\n\n<\/noscript>\u7fbd\u767d<\/div><\/div>\n\u7d9a\u3044\u3066 (2) \u3067\u3059\u3002<\/p>\n<\/div><\/div><\/div><\/div>\n\n\n\n$x=2$ \u306e\u4f4d\u7f6e\u306b\u304a\u3051\u308b\u96fb\u4f4d\u3092\u8003\u3048\u308b\u306b\u3042\u305f\u3063\u3066\u306f\uff0c$x=4$ \u306e\u4f4d\u7f6e\u306e\u96fb\u8377 $\\rmB$ \u306b\u3088\u308b\u96fb\u4f4d $V_2$ \u3082\u8003\u3048\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n$x=4$ \u304b\u3089\u306e\u8ddd\u96e2\u304c $4-2=2$ \u306a\u306e\u3067\uff0c$$V_2=k\\bun{-4q}{2}=-2kq$$\u3067\u3042\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u306d\u3002<\/p>\n\n\n\n\u6c42\u3081\u308b $V$ \u306f\uff0c$V_1$ \u3068 $V_2$ \u306e\u548c\u306a\u306e\u3067\uff0c$$V=V_1+V_2=-k\\bun{3q}{2}$$\u304c\u7b54\u3048\u3067\u3059\u3002<\/p>\n\n\n\n(3) \u306e\u89e3\u304d\u65b9<\/h3>\n\n\n\n\n(3) \u306f\u5c11\u3057\u96e3\u3057\u3044\u3067\u3059\u306d\u3002<\/p>\n<\/div><\/div><\/div><\/noscript>\u751f\u5f92<\/div><\/div><\/div>\n\n\n\n\u307e\u305a\uff0c\u96fb\u4f4d\u306e\u5f0f\u304c\u300c$k\\bun{Q}{r}$\u300d\u306e\u5f62\u3092\u3057\u3066\u3044\u308b\u305f\u3081\uff0c\u96fb\u8377\u306e\u5927\u304d\u3055\u304c\u5927\u304d\u3044\u307b\u3069\uff0c\u96fb\u8377\u304b\u3089\u306e\u8ddd\u96e2\u304c\u8fd1\u3044\u4f4d\u7f6e\u307b\u3069\uff0c\u96fb\u4f4d\u304c\u5927\u304d\u304f\u306a\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n\n\n\n\u672c\u554f\u3067\u306f\uff0c\u96fb\u8377 $\\rmB$ \u306e\u65b9\u304c\u5927\u304d\u3055\u304c\u5927\u304d\u306a\u96fb\u8377\u3092\u6301\u3063\u3066\u3044\u308b\u305f\u3081\uff0c\u300c\u96fb\u4f4d\u304c 0 \u306b\u306a\u308b\u306e\u306f\uff0c\u96fb\u8377 $\\rmB$ \u3088\u308a\u3082\u96fb\u8377 $\\rmA$ \u306b\u8fd1\u3044\u4f4d\u7f6e\u3067\u3042\u308b\u300d\u3068\u3044\u3046\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u306d\u3002<\/p>\n\n\n\n\u3053\u306e\u3088\u3046\u306a\u4f4d\u7f6e\u304c\u5b58\u5728\u3059\u308b\u306e\u306f\uff0c\u2460 $x<0$ \u3068\uff0c\u2461 $0<x<4$ \u306e\u9818\u57df\u306e2\u3064\u3067\u3059\u3002<\/p>\n\n\n\n<\/div>\n\n\n\n\u307e\u305f\uff0c\u4f4d\u7f6e $x$ \u3067\u306e\u96fb\u4f4d $V(x)$ \u306f\u96fb\u4f4d\u306e\u91cd\u306d\u5408\u308f\u305b\u3092\u8003\u3048\u308b\u3053\u3068\u3067\uff0c$$V(x)=k\\Bun{q}{|x|}-k\\bun{4q}{|4-x|}$$\u3067\u3042\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<\/noscript>\u7fbd\u767d<\/div><\/div>\n\u9818\u57df\u3054\u3068\u306b\u7d76\u5bfe\u5024\u3092\u5916\u3057\u306a\u304c\u3089\u8003\u3048\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/div><\/div><\/div><\/div>\n\n\n\n$x<0$ \u306e\u9818\u57df<\/strong><\/h3>\n\n\n\n$x<0$\uff0c$4-x>0$ \u306a\u306e\u3067\uff0c$V(x)=0$ \u3092\u8003\u3048\u3066\uff0c$$-\\bun{q}{x}-k\\bun{4q}{4-x}=0 \\qquad \\therefore \\quad x=-\\bun43$$<\/p>\n\n\n\n$0<x<4$ \u306e\u9818\u57df<\/h3>\n\n\n\n$x>0$\uff0c$4-x>0$ \u306a\u306e\u3067\uff0c$V(x)=0$ \u3092\u8003\u3048\u3066\uff0c$$\\bun{q}{x}-k\\bun{4q}{4-x}=0 \\qquad \\therefore \\quad x=\\bun45$$<\/p>\n\n\n\n<\/div>\n\n\n\n\u4ee5\u4e0a\u3092\u5408\u308f\u305b\u305f\uff0c$x=-\\Bun43,\\,\\bun45$ \u304c\u7b54\u3048\u3067\u3059\u3002<\/p>\n\n\n\n(3)\u306e\u8003\u3048\u65b9<\/h3>\n\n\n\n(3) \u3067\u306f\u5358\u7d14\u306b\uff0c$$k\\Bun{q}{|x|}-k\\bun{4q}{|4-x|}=0$$\u3068\u3044\u3046\u65b9\u7a0b\u5f0f\u3092\u89e3\u3044\u3066\u3082ok\u3067\u3059\u3002<\/p>\n\n\n\n\u4e0a\u306e\u89e3\u7b54\u306e\u3088\u3046\u306b\uff0c\u96fb\u4f4d\u306e\u5f0f\u3092\u5143\u306b\u8003\u3048\u308b\u9818\u57df\u3092\u7d5e\u308a\u8fbc\u3080\u3053\u3068\u304c\u3067\u304d\u308c\u3070\uff0c\u3088\u308a\u697d\u306b\u89e3\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u306d\u3002<\/p>\n\n\n\n\u96fb\u4f4d\u306e\u30b0\u30e9\u30d5\u306e\u8003\u5bdf<\/h2>\n\n\n\n\u4f8b\u984c\u3067\u306f\u96fb\u4f4d\u304c $0$ \u306b\u306a\u308b\u70b9\u306e\u307f\u3092\u6c42\u3081\u307e\u3057\u305f\u304c\uff0c\u300c\u4f4d\u7f6e $x$ \u306b\u304a\u3051\u308b\u96fb\u4f4d $V(x)$ \u306e\u30b0\u30e9\u30d5\u3092\u304b\u3051\u300d\u3068\u3044\u308f\u308c\u305f\u3089\u304b\u3051\u307e\u3059\u304b\u2026\uff1f<\/p>\n\n\n\n<\/noscript>\u7fbd\u767d<\/div><\/div>\n\u30b0\u30e9\u30d5\u306e\u6982\u5f62\u3092\u8003\u3048\u308b\u306b\u3042\u305f\u3063\u3066\u306f\u3044\u304f\u3064\u304b\u30dd\u30a4\u30f3\u30c8\u304c\u3042\u308a\u307e\u3059\u306e\u3067\uff0c\u9806\u756a\u306b\u78ba\u8a8d\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/div><\/div><\/div><\/div>\n\n\n\n\u30b0\u30e9\u30d5\u306e\u8db3\u3057\u5408\u308f\u305b<\/h3>\n\n\n\n$V(x)=k\\Bun{q}{|x|}-k\\bun{4q}{|4-x|}$ \u306e\u30b0\u30e9\u30d5\u3068\u3044\u308f\u308c\u308b\u3068\uff0c\u30d1\u30c3\u3068\u6982\u5f62\u3092\u601d\u3044\u6d6e\u304b\u3079\u308b\u306e\u306f\u96e3\u3057\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n$V(x)$ \u306f\u96fb\u8377 $\\rmA$ \u306b\u3088\u308b\u96fb\u4f4d $V_1(x)$ \u3068\u96fb\u8377 $\\rmB$ \u306b\u3088\u308b\u96fb\u4f4d $V_2(x)$ \u306e\u91cd\u306d\u5408\u308f\u305b\u3067\u3059\u306e\u3067\uff0c\u30b0\u30e9\u30d5\u306b\u95a2\u3057\u3066\u3082\u305d\u308c\u305e\u308c\u306e\u30b0\u30e9\u30d5\u306e\u8db3\u3057\u7b97\u3068\u3057\u3066\u8003\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n<\/noscript><\/figure>\n\n\n\n\u7279\u5b9a\u306e\u4f4d\u7f6e\u3067\u306e\u632f\u308b\u821e\u3044<\/h3>\n\n\n\n\u96fb\u8377 $\\rmA$ \u306e\u3054\u304f\u8fd1\u304f\u3067\u306f\u6b63\u306e\u7121\u9650\u5927\u306b\uff0c\u96fb\u8377 $\\rmB$ \u306e\u3054\u304f\u8fd1\u304f\u3067\u306f\u8ca0\u306e\u7121\u9650\u5927\u306b\u767a\u6563\u3057\u307e\u3059\u3002<\/p>\n\n\n\n\u307e\u305f\uff0c\u7121\u9650\u9060\u65b9\u3067\u306f\u96fb\u8377\u304b\u3089\u5341\u5206\u306b\u9060\u3056\u304b\u308b\u305f\u3081\uff0c\u96fb\u4f4d\u3082 $0$ \u3068\u306a\u308a\u307e\u3059\u306d\u3002<\/p>\n\n\n\n\u96fb\u4f4d\u304c $0$ \u3068\u306a\u308b\u4f4d\u7f6e<\/h3>\n\n\n\n\u96fb\u4f4d\u306e\u30b0\u30e9\u30d5\u306e\u50be\u304d\u306e $-1$ \u500d\u306f\u96fb\u5834\u3092\u8868\u3059\u306e\u3067\u3057\u305f\u3002\u3068\u3044\u3046\u3053\u3068\u306f\uff0c\u96fb\u5834\u304c $0$ \u306e\u4f4d\u7f6e\u3067\u306f\u96fb\u4f4d\u306e\u30b0\u30e9\u30d5\u306e\u50be\u304d\u3082 $0$ \u306b\u306a\u308a\u307e\u3059\u306d\u3002<\/p>\n\n\n\n\u4f8b\u984c\u3067\uff0c$x=-4$ \u306e\u4f4d\u7f6e\u306e\u96fb\u5834\u304c $0$ \u3068\u306a\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3057\u305f\u306e\u3067\uff0c$x=-4$ \u306e\u4f4d\u7f6e\u306b\u304a\u3051\u308b $V(x)$ \u306e\u30b0\u30e9\u30d5\u306e\u50be\u304d\u306f $0$ \u3067\u3059\uff01<\/p>\n\n\n\n\u30b0\u30e9\u30d5\u306e\u63cf\u753b<\/h3>\n\n\n\n\u4ee5\u4e0a\u3092\u8e0f\u307e\u3048\u3066\u30b0\u30e9\u30d5\u3092\u304b\u304f\u3068\uff0c\u56f3\u306e\u3088\u3046\u306a\u6982\u5f62\u304c\u5f97\u3089\u308c\u307e\u3059\u3002<\/p>\n\n\n<\/noscript><\/figure>\n\n\n\n\u30b0\u30e9\u30d5\u306e\u5f62\u81ea\u4f53\u306f\u8907\u96d1\u3067\u3059\u304c\uff0c3\u3064\u306e\u6027\u8cea\u306b\u6ce8\u76ee\u3059\u308b\u3053\u3068\u3067\uff0c\u5fae\u5206\u3059\u308b\u3053\u3068\u306a\u304f\u30b0\u30e9\u30d5\u306e\u6982\u5f62\u3092\u77e5\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u3059\u3002<\/p>\n\n\n\n<\/noscript>\u7fbd\u767d<\/div><\/div>\n\u3053\u308c\u3063\u3066\u51c4\u304f\u306a\u3044\u3067\u3059\u304b\u2026\uff1f<\/p>\n<\/div><\/div><\/div><\/div>\n\n\n\n\u305b\u3063\u304b\u304f\u30b0\u30e9\u30d5\u306e\u6982\u5f62\u3092\u304b\u3044\u305f\u306e\u3067\uff0c\u3053\u308c\u3092\u5229\u7528\u3057\u305f\u554f\u984c\u3092\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n \n \n \n \n <\/i> \u4f8b\u984c\n <\/span>\n <\/p>\n\n \n \u4e0a\u306e\u4f8b\u984c\u3067\u6271\u3063\u305f\u96fb\u4f4d\u3068\u540c\u3058\u3088\u3046\u306b\u96fb\u8377\u3092\u914d\u7f6e\u3059\u308b\u3002$x$ \u8ef8\u4e0a\u306e\u8ca0\u306e\u65b9\u5411\u306e\u7121\u9650\u9060\u65b9\u306b $+Q$ \u306e\u96fb\u8377\u3092\u305d\u3063\u3068\u304a\u3044\u305f\u3068\u304d\uff0c\u3053\u306e\u96fb\u8377\u306f\u3069\u306e\u3088\u3046\u306a\u904b\u52d5\u3092\u3059\u308b\u304b\u3002<\/p>\n <\/div>\n <\/div>\n\n\n\n\u89e3\u304d\u65b9<\/h3>\n\n\n\n\u96fb\u8377\u306e\u52d5\u304d\u3092\u8003\u3048\u308b\u969b\u306b\u306f\u300c\u96fb\u4f4d\u306e\u30b0\u30e9\u30d5\u3092\u5742\u9053\u3068\u3057\u3066\u8003\u3048\u308b\u3068\u4fbf\u5229\u300d\u3067\u3057\u305f\u3002<\/p>\n\n\n\n\u4eca\u56de\u306f\u8ca0\u306e\u7121\u9650\u9060\u65b9\u306b\u96fb\u8377\u3092\u914d\u7f6e\u3057\u3066\u3044\u307e\u3059\u304c\uff0c$x\\to-\\infty$ \u3067 $V(x)\\to0$ \u3067\u3059\u306e\u3067\uff0c\u9ad8\u3055 0 \u306e\u3068\u3053\u308d\u304b\u3089\u5742\u9053\u3092\u8ee2\u304c\u308a\u59cb\u3081\u307e\u3059\u3002<\/p>\n\n\n\n<\/div>\n\n\n\n\u901f\u3055\u304c\u6700\u5927\u306b\u306a\u308b\u306e\u306f\u8c37\u5e95\u306e\u90e8\u5206\u3067\u3059\u3002\u30b0\u30e9\u30d5\u306e\u6982\u5f62\u304b\u3089\uff0c$x=-4$ \u306e\u4f4d\u7f6e\u3060\u3068\u3059\u3050\u306b\u308f\u304b\u308a\u307e\u3059\u306d\u3002<\/p>\n\n\n\n\u96fb\u8377\u306e\u8cea\u91cf\u3092 $m$\uff0c$x=-4$ \u306e\u4f4d\u7f6e\u306b\u304a\u3051\u308b\u96fb\u8377\u306e\u901f\u3055\u3092 $v$ \u3068\u3059\u308c\u3070\uff0c\u30a8\u30cd\u30eb\u30ae\u30fc\u4fdd\u5b58\u5247\u3088\u308a\uff0c<\/p>\n\n\n\n$$0=\\bun12mv^2+\\left(k\\bun{Qq}{|-4|}-k\\bun{4Qq}{|-4-4|}\\right)$$<\/p>\n\n\n\n\u304c\u6210\u7acb\u3057\u307e\u3059\u3002\u3053\u308c\u3092\u89e3\u304f\u3053\u3068\u3067\uff0c<\/p>\n\n\n\n$$v=\\sqrt{\\bun{kQq}{2m}}$$<\/p>\n\n\n\n\u304c\u5f97\u3089\u308c\u307e\u3059\u306d\u3002<\/p>\n\n\n\n<\/div>\n\n\n\n$x=-4$ \u3092\u901a\u308a\u904e\u304e\u308b\u3068\uff0c\u96fb\u8377\u306f\u5742\u9053\u3092\u767b\u308a\u306f\u3058\u3081\u307e\u3059\u3002<\/p>\n\n\n\n\u767b\u308c\u308b\u9ad8\u3055\u306f\u30b9\u30bf\u30fc\u30c8\u5730\u70b9\u3068\u540c\u3058 $V(x)=0$ \u306e\u3068\u3053\u308d\u307e\u3067\u3067\u3059\u306e\u3067\uff0c$x=-\\bun43$ \u306e\u4f4d\u7f6e\u307e\u3067\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u306e\u70b9\u3067\u6298\u308a\u8fd4\u3057\u3066\uff0c\u518d\u3073 $x\\to-\\infty$ \u307e\u3067\u8ee2\u304c\u3063\u3066\u3044\u304f\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n\u25b6 \u96fb\u5834\u3068\u96fb\u4f4d\u30b7\u30ea\u30fc\u30ba\u306e\u5b66\u7fd2\u9806\u30ac\u30a4\u30c9\u30fb\u8981\u70b9\u6574\u7406\u306f\u3053\u3061\u3089<\/strong><\/p>\n\n\n\n\u96fb\u5834\u3068\u96fb\u4f4d\u306e\u307e\u3068\u3081\u3010\u5b66\u7fd2\u30ed\u30fc\u30c9\u30de\u30c3\u30d7\u3011<\/div>\u96fb\u5834\u3068\u96fb\u4f4d\u306e\u9055\u3044\u3068\u4f7f\u3044\u5206\u3051\u30fb\u70b9\u96fb\u8377\u306e\u5f0f\u30fb\u3064\u307e\u305a\u304d\u30dd\u30a4\u30f3\u30c8\u30921\u30da\u30fc\u30b8\u306b\u51dd\u7e2e\u3057\u305f\u5b66\u7fd2\u9806\u30ac\u30a4\u30c9\u3067\u3059\u3002<\/div>\u8a73\u3057\u304f\u898b\u308b<\/a><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"\u8907\u6570\u306e\u70b9\u96fb\u8377\u306b\u3088\u308b\u96fb\u4f4d\u3092\u30b0\u30e9\u30d5\u306e\u8db3\u3057\u5408\u308f\u305b\u3067\u6349\u3048\uff0c\u96fb\u4f4d\u304c0\u306b\u306a\u308b\u4f4d\u7f6e\u3092\u6c42\u3081\u308b\u554f\u984c\u3092\u6574\u7406\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"author":1,"featured_media":6735,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[39,23],"tags":[],"class_list":["post-6832","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-39","category-electromagnetics"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\n\t\t\n
$x=2$ \u306e\u4f4d\u7f6e\u306b\u304a\u3051\u308b\uff0c\u96fb\u8377 $\\rmA$ \u306b\u3088\u308b\u96fb\u4f4d $V_1$ \u3092\u6c42\u3081\u3088\u3002<\/p><\/p>
$x=2$ \u306e\u4f4d\u7f6e\u306e\u96fb\u4f4d $V$ \u3092\u6c42\u3081\uff0c\u3053\u306e\u4f4d\u7f6e\u306b $q$ \u306e\u96fb\u8377\u3092\u304a\u3044\u305f\u3068\u304d\u306b\u6301\u3064\u4f4d\u7f6e\u30a8\u30cd\u30eb\u30ae\u30fc\u3092\u6c42\u3081\u3088\u3002<\/p><\/p>
$x$ \u8ef8\u4e0a\u306b\u304a\u3044\u3066\uff0c\u7121\u9650\u9060\u65b9\u4ee5\u5916\u3067\u96fb\u4f4d\u304c $0$ \u3068\u306a\u308b\u70b9\u3092\u6c42\u3081\u3088\u3002<\/p><\/p>
<\/p>\n <\/div>\n <\/div>\n\n\n\n
\u96fb\u5834\u306e\u554f\u984c\u3068\u7570\u306a\u308a\uff0c\u4eca\u56de\u306e\u554f\u984c\u3067\u554f\u308f\u308c\u3066\u3044\u308b\u306e\u306f\u300c\u96fb\u4f4d\u300d\u3067\u3042\u308a\uff0c\u5411\u304d\u304c\u306a\u3044\u70b9\u306b\u6ce8\u610f\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
\u307e\u305a\u306f (1) \u3067\u3059\u3002\u3053\u3061\u3089\u306f\u516c\u5f0f\u3092\u4f7f\u3046\u3060\u3051\u306e\u554f\u984c\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u539f\u70b9\u3068\u306e\u8ddd\u96e2\u304c $2$ \u306a\u306e\u3067\uff0c$$V_1=k\\bun{q}{2}$$\u3067\u3059\u306d\u3002<\/p>\n\n\n\n
\u7d9a\u3044\u3066 (2) \u3067\u3059\u3002<\/p>\n<\/div><\/div><\/div><\/div>\n\n\n\n
$x=2$ \u306e\u4f4d\u7f6e\u306b\u304a\u3051\u308b\u96fb\u4f4d\u3092\u8003\u3048\u308b\u306b\u3042\u305f\u3063\u3066\u306f\uff0c$x=4$ \u306e\u4f4d\u7f6e\u306e\u96fb\u8377 $\\rmB$ \u306b\u3088\u308b\u96fb\u4f4d $V_2$ \u3082\u8003\u3048\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
$x=4$ \u304b\u3089\u306e\u8ddd\u96e2\u304c $4-2=2$ \u306a\u306e\u3067\uff0c$$V_2=k\\bun{-4q}{2}=-2kq$$\u3067\u3042\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u306d\u3002<\/p>\n\n\n\n
\u6c42\u3081\u308b $V$ \u306f\uff0c$V_1$ \u3068 $V_2$ \u306e\u548c\u306a\u306e\u3067\uff0c$$V=V_1+V_2=-k\\bun{3q}{2}$$\u304c\u7b54\u3048\u3067\u3059\u3002<\/p>\n\n\n\n
(3) \u306f\u5c11\u3057\u96e3\u3057\u3044\u3067\u3059\u306d\u3002<\/p>\n<\/div><\/div><\/div>
\u307e\u305a\uff0c\u96fb\u4f4d\u306e\u5f0f\u304c\u300c$k\\bun{Q}{r}$\u300d\u306e\u5f62\u3092\u3057\u3066\u3044\u308b\u305f\u3081\uff0c\u96fb\u8377\u306e\u5927\u304d\u3055\u304c\u5927\u304d\u3044\u307b\u3069\uff0c\u96fb\u8377\u304b\u3089\u306e\u8ddd\u96e2\u304c\u8fd1\u3044\u4f4d\u7f6e\u307b\u3069\uff0c\u96fb\u4f4d\u304c\u5927\u304d\u304f\u306a\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
\u672c\u554f\u3067\u306f\uff0c\u96fb\u8377 $\\rmB$ \u306e\u65b9\u304c\u5927\u304d\u3055\u304c\u5927\u304d\u306a\u96fb\u8377\u3092\u6301\u3063\u3066\u3044\u308b\u305f\u3081\uff0c\u300c\u96fb\u4f4d\u304c 0 \u306b\u306a\u308b\u306e\u306f\uff0c\u96fb\u8377 $\\rmB$ \u3088\u308a\u3082\u96fb\u8377 $\\rmA$ \u306b\u8fd1\u3044\u4f4d\u7f6e\u3067\u3042\u308b\u300d\u3068\u3044\u3046\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u306d\u3002<\/p>\n\n\n\n
\u3053\u306e\u3088\u3046\u306a\u4f4d\u7f6e\u304c\u5b58\u5728\u3059\u308b\u306e\u306f\uff0c\u2460 $x<0$ \u3068\uff0c\u2461 $0<x<4$ \u306e\u9818\u57df\u306e2\u3064\u3067\u3059\u3002<\/p>\n\n\n\n
\u307e\u305f\uff0c\u4f4d\u7f6e $x$ \u3067\u306e\u96fb\u4f4d $V(x)$ \u306f\u96fb\u4f4d\u306e\u91cd\u306d\u5408\u308f\u305b\u3092\u8003\u3048\u308b\u3053\u3068\u3067\uff0c$$V(x)=k\\Bun{q}{|x|}-k\\bun{4q}{|4-x|}$$\u3067\u3042\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
\u9818\u57df\u3054\u3068\u306b\u7d76\u5bfe\u5024\u3092\u5916\u3057\u306a\u304c\u3089\u8003\u3048\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/div><\/div><\/div><\/div>\n\n\n\n
$x<0$\uff0c$4-x>0$ \u306a\u306e\u3067\uff0c$V(x)=0$ \u3092\u8003\u3048\u3066\uff0c$$-\\bun{q}{x}-k\\bun{4q}{4-x}=0 \\qquad \\therefore \\quad x=-\\bun43$$<\/p>\n\n\n\n
$x>0$\uff0c$4-x>0$ \u306a\u306e\u3067\uff0c$V(x)=0$ \u3092\u8003\u3048\u3066\uff0c$$\\bun{q}{x}-k\\bun{4q}{4-x}=0 \\qquad \\therefore \\quad x=\\bun45$$<\/p>\n\n\n\n
\u4ee5\u4e0a\u3092\u5408\u308f\u305b\u305f\uff0c$x=-\\Bun43,\\,\\bun45$ \u304c\u7b54\u3048\u3067\u3059\u3002<\/p>\n\n\n\n
(3) \u3067\u306f\u5358\u7d14\u306b\uff0c$$k\\Bun{q}{|x|}-k\\bun{4q}{|4-x|}=0$$\u3068\u3044\u3046\u65b9\u7a0b\u5f0f\u3092\u89e3\u3044\u3066\u3082ok\u3067\u3059\u3002<\/p>\n\n\n\n
\u4e0a\u306e\u89e3\u7b54\u306e\u3088\u3046\u306b\uff0c\u96fb\u4f4d\u306e\u5f0f\u3092\u5143\u306b\u8003\u3048\u308b\u9818\u57df\u3092\u7d5e\u308a\u8fbc\u3080\u3053\u3068\u304c\u3067\u304d\u308c\u3070\uff0c\u3088\u308a\u697d\u306b\u89e3\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u306d\u3002<\/p>\n\n\n\n
\u4f8b\u984c\u3067\u306f\u96fb\u4f4d\u304c $0$ \u306b\u306a\u308b\u70b9\u306e\u307f\u3092\u6c42\u3081\u307e\u3057\u305f\u304c\uff0c\u300c\u4f4d\u7f6e $x$ \u306b\u304a\u3051\u308b\u96fb\u4f4d $V(x)$ \u306e\u30b0\u30e9\u30d5\u3092\u304b\u3051\u300d\u3068\u3044\u308f\u308c\u305f\u3089\u304b\u3051\u307e\u3059\u304b\u2026\uff1f<\/p>\n\n\n\n
\u30b0\u30e9\u30d5\u306e\u6982\u5f62\u3092\u8003\u3048\u308b\u306b\u3042\u305f\u3063\u3066\u306f\u3044\u304f\u3064\u304b\u30dd\u30a4\u30f3\u30c8\u304c\u3042\u308a\u307e\u3059\u306e\u3067\uff0c\u9806\u756a\u306b\u78ba\u8a8d\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/div><\/div><\/div><\/div>\n\n\n\n
$V(x)=k\\Bun{q}{|x|}-k\\bun{4q}{|4-x|}$ \u306e\u30b0\u30e9\u30d5\u3068\u3044\u308f\u308c\u308b\u3068\uff0c\u30d1\u30c3\u3068\u6982\u5f62\u3092\u601d\u3044\u6d6e\u304b\u3079\u308b\u306e\u306f\u96e3\u3057\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
$V(x)$ \u306f\u96fb\u8377 $\\rmA$ \u306b\u3088\u308b\u96fb\u4f4d $V_1(x)$ \u3068\u96fb\u8377 $\\rmB$ \u306b\u3088\u308b\u96fb\u4f4d $V_2(x)$ \u306e\u91cd\u306d\u5408\u308f\u305b\u3067\u3059\u306e\u3067\uff0c\u30b0\u30e9\u30d5\u306b\u95a2\u3057\u3066\u3082\u305d\u308c\u305e\u308c\u306e\u30b0\u30e9\u30d5\u306e\u8db3\u3057\u7b97\u3068\u3057\u3066\u8003\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n<\/noscript><\/figure>\n\n\n\n\u7279\u5b9a\u306e\u4f4d\u7f6e\u3067\u306e\u632f\u308b\u821e\u3044<\/h3>\n\n\n\n\u96fb\u8377 $\\rmA$ \u306e\u3054\u304f\u8fd1\u304f\u3067\u306f\u6b63\u306e\u7121\u9650\u5927\u306b\uff0c\u96fb\u8377 $\\rmB$ \u306e\u3054\u304f\u8fd1\u304f\u3067\u306f\u8ca0\u306e\u7121\u9650\u5927\u306b\u767a\u6563\u3057\u307e\u3059\u3002<\/p>\n\n\n\n\u307e\u305f\uff0c\u7121\u9650\u9060\u65b9\u3067\u306f\u96fb\u8377\u304b\u3089\u5341\u5206\u306b\u9060\u3056\u304b\u308b\u305f\u3081\uff0c\u96fb\u4f4d\u3082 $0$ \u3068\u306a\u308a\u307e\u3059\u306d\u3002<\/p>\n\n\n\n\u96fb\u4f4d\u304c $0$ \u3068\u306a\u308b\u4f4d\u7f6e<\/h3>\n\n\n\n\u96fb\u4f4d\u306e\u30b0\u30e9\u30d5\u306e\u50be\u304d\u306e $-1$ \u500d\u306f\u96fb\u5834\u3092\u8868\u3059\u306e\u3067\u3057\u305f\u3002\u3068\u3044\u3046\u3053\u3068\u306f\uff0c\u96fb\u5834\u304c $0$ \u306e\u4f4d\u7f6e\u3067\u306f\u96fb\u4f4d\u306e\u30b0\u30e9\u30d5\u306e\u50be\u304d\u3082 $0$ \u306b\u306a\u308a\u307e\u3059\u306d\u3002<\/p>\n\n\n\n\u4f8b\u984c\u3067\uff0c$x=-4$ \u306e\u4f4d\u7f6e\u306e\u96fb\u5834\u304c $0$ \u3068\u306a\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3057\u305f\u306e\u3067\uff0c$x=-4$ \u306e\u4f4d\u7f6e\u306b\u304a\u3051\u308b $V(x)$ \u306e\u30b0\u30e9\u30d5\u306e\u50be\u304d\u306f $0$ \u3067\u3059\uff01<\/p>\n\n\n\n\u30b0\u30e9\u30d5\u306e\u63cf\u753b<\/h3>\n\n\n\n\u4ee5\u4e0a\u3092\u8e0f\u307e\u3048\u3066\u30b0\u30e9\u30d5\u3092\u304b\u304f\u3068\uff0c\u56f3\u306e\u3088\u3046\u306a\u6982\u5f62\u304c\u5f97\u3089\u308c\u307e\u3059\u3002<\/p>\n\n\n<\/noscript><\/figure>\n\n\n\n\u30b0\u30e9\u30d5\u306e\u5f62\u81ea\u4f53\u306f\u8907\u96d1\u3067\u3059\u304c\uff0c3\u3064\u306e\u6027\u8cea\u306b\u6ce8\u76ee\u3059\u308b\u3053\u3068\u3067\uff0c\u5fae\u5206\u3059\u308b\u3053\u3068\u306a\u304f\u30b0\u30e9\u30d5\u306e\u6982\u5f62\u3092\u77e5\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u3059\u3002<\/p>\n\n\n\n<\/noscript>\u7fbd\u767d<\/div><\/div>\n\u3053\u308c\u3063\u3066\u51c4\u304f\u306a\u3044\u3067\u3059\u304b\u2026\uff1f<\/p>\n<\/div><\/div><\/div><\/div>\n\n\n\n\u305b\u3063\u304b\u304f\u30b0\u30e9\u30d5\u306e\u6982\u5f62\u3092\u304b\u3044\u305f\u306e\u3067\uff0c\u3053\u308c\u3092\u5229\u7528\u3057\u305f\u554f\u984c\u3092\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n \n \n \n \n <\/i> \u4f8b\u984c\n <\/span>\n <\/p>\n\n \n \u4e0a\u306e\u4f8b\u984c\u3067\u6271\u3063\u305f\u96fb\u4f4d\u3068\u540c\u3058\u3088\u3046\u306b\u96fb\u8377\u3092\u914d\u7f6e\u3059\u308b\u3002$x$ \u8ef8\u4e0a\u306e\u8ca0\u306e\u65b9\u5411\u306e\u7121\u9650\u9060\u65b9\u306b $+Q$ \u306e\u96fb\u8377\u3092\u305d\u3063\u3068\u304a\u3044\u305f\u3068\u304d\uff0c\u3053\u306e\u96fb\u8377\u306f\u3069\u306e\u3088\u3046\u306a\u904b\u52d5\u3092\u3059\u308b\u304b\u3002<\/p>\n <\/div>\n <\/div>\n\n\n\n\u89e3\u304d\u65b9<\/h3>\n\n\n\n\u96fb\u8377\u306e\u52d5\u304d\u3092\u8003\u3048\u308b\u969b\u306b\u306f\u300c\u96fb\u4f4d\u306e\u30b0\u30e9\u30d5\u3092\u5742\u9053\u3068\u3057\u3066\u8003\u3048\u308b\u3068\u4fbf\u5229\u300d\u3067\u3057\u305f\u3002<\/p>\n\n\n\n\u4eca\u56de\u306f\u8ca0\u306e\u7121\u9650\u9060\u65b9\u306b\u96fb\u8377\u3092\u914d\u7f6e\u3057\u3066\u3044\u307e\u3059\u304c\uff0c$x\\to-\\infty$ \u3067 $V(x)\\to0$ \u3067\u3059\u306e\u3067\uff0c\u9ad8\u3055 0 \u306e\u3068\u3053\u308d\u304b\u3089\u5742\u9053\u3092\u8ee2\u304c\u308a\u59cb\u3081\u307e\u3059\u3002<\/p>\n\n\n\n<\/div>\n\n\n\n\u901f\u3055\u304c\u6700\u5927\u306b\u306a\u308b\u306e\u306f\u8c37\u5e95\u306e\u90e8\u5206\u3067\u3059\u3002\u30b0\u30e9\u30d5\u306e\u6982\u5f62\u304b\u3089\uff0c$x=-4$ \u306e\u4f4d\u7f6e\u3060\u3068\u3059\u3050\u306b\u308f\u304b\u308a\u307e\u3059\u306d\u3002<\/p>\n\n\n\n\u96fb\u8377\u306e\u8cea\u91cf\u3092 $m$\uff0c$x=-4$ \u306e\u4f4d\u7f6e\u306b\u304a\u3051\u308b\u96fb\u8377\u306e\u901f\u3055\u3092 $v$ \u3068\u3059\u308c\u3070\uff0c\u30a8\u30cd\u30eb\u30ae\u30fc\u4fdd\u5b58\u5247\u3088\u308a\uff0c<\/p>\n\n\n\n$$0=\\bun12mv^2+\\left(k\\bun{Qq}{|-4|}-k\\bun{4Qq}{|-4-4|}\\right)$$<\/p>\n\n\n\n\u304c\u6210\u7acb\u3057\u307e\u3059\u3002\u3053\u308c\u3092\u89e3\u304f\u3053\u3068\u3067\uff0c<\/p>\n\n\n\n$$v=\\sqrt{\\bun{kQq}{2m}}$$<\/p>\n\n\n\n\u304c\u5f97\u3089\u308c\u307e\u3059\u306d\u3002<\/p>\n\n\n\n<\/div>\n\n\n\n$x=-4$ \u3092\u901a\u308a\u904e\u304e\u308b\u3068\uff0c\u96fb\u8377\u306f\u5742\u9053\u3092\u767b\u308a\u306f\u3058\u3081\u307e\u3059\u3002<\/p>\n\n\n\n\u767b\u308c\u308b\u9ad8\u3055\u306f\u30b9\u30bf\u30fc\u30c8\u5730\u70b9\u3068\u540c\u3058 $V(x)=0$ \u306e\u3068\u3053\u308d\u307e\u3067\u3067\u3059\u306e\u3067\uff0c$x=-\\bun43$ \u306e\u4f4d\u7f6e\u307e\u3067\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u306e\u70b9\u3067\u6298\u308a\u8fd4\u3057\u3066\uff0c\u518d\u3073 $x\\to-\\infty$ \u307e\u3067\u8ee2\u304c\u3063\u3066\u3044\u304f\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n\u25b6 \u96fb\u5834\u3068\u96fb\u4f4d\u30b7\u30ea\u30fc\u30ba\u306e\u5b66\u7fd2\u9806\u30ac\u30a4\u30c9\u30fb\u8981\u70b9\u6574\u7406\u306f\u3053\u3061\u3089<\/strong><\/p>\n\n\n\n\u96fb\u5834\u3068\u96fb\u4f4d\u306e\u307e\u3068\u3081\u3010\u5b66\u7fd2\u30ed\u30fc\u30c9\u30de\u30c3\u30d7\u3011<\/div>\u96fb\u5834\u3068\u96fb\u4f4d\u306e\u9055\u3044\u3068\u4f7f\u3044\u5206\u3051\u30fb\u70b9\u96fb\u8377\u306e\u5f0f\u30fb\u3064\u307e\u305a\u304d\u30dd\u30a4\u30f3\u30c8\u30921\u30da\u30fc\u30b8\u306b\u51dd\u7e2e\u3057\u305f\u5b66\u7fd2\u9806\u30ac\u30a4\u30c9\u3067\u3059\u3002<\/div>\u8a73\u3057\u304f\u898b\u308b<\/a><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"\u8907\u6570\u306e\u70b9\u96fb\u8377\u306b\u3088\u308b\u96fb\u4f4d\u3092\u30b0\u30e9\u30d5\u306e\u8db3\u3057\u5408\u308f\u305b\u3067\u6349\u3048\uff0c\u96fb\u4f4d\u304c0\u306b\u306a\u308b\u4f4d\u7f6e\u3092\u6c42\u3081\u308b\u554f\u984c\u3092\u6574\u7406\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"author":1,"featured_media":6735,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[39,23],"tags":[],"class_list":["post-6832","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-39","category-electromagnetics"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\n\t\t\n
\u96fb\u8377 $\\rmA$ \u306e\u3054\u304f\u8fd1\u304f\u3067\u306f\u6b63\u306e\u7121\u9650\u5927\u306b\uff0c\u96fb\u8377 $\\rmB$ \u306e\u3054\u304f\u8fd1\u304f\u3067\u306f\u8ca0\u306e\u7121\u9650\u5927\u306b\u767a\u6563\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
\u307e\u305f\uff0c\u7121\u9650\u9060\u65b9\u3067\u306f\u96fb\u8377\u304b\u3089\u5341\u5206\u306b\u9060\u3056\u304b\u308b\u305f\u3081\uff0c\u96fb\u4f4d\u3082 $0$ \u3068\u306a\u308a\u307e\u3059\u306d\u3002<\/p>\n\n\n\n
\u96fb\u4f4d\u306e\u30b0\u30e9\u30d5\u306e\u50be\u304d\u306e $-1$ \u500d\u306f\u96fb\u5834\u3092\u8868\u3059\u306e\u3067\u3057\u305f\u3002\u3068\u3044\u3046\u3053\u3068\u306f\uff0c\u96fb\u5834\u304c $0$ \u306e\u4f4d\u7f6e\u3067\u306f\u96fb\u4f4d\u306e\u30b0\u30e9\u30d5\u306e\u50be\u304d\u3082 $0$ \u306b\u306a\u308a\u307e\u3059\u306d\u3002<\/p>\n\n\n\n
\u4f8b\u984c\u3067\uff0c$x=-4$ \u306e\u4f4d\u7f6e\u306e\u96fb\u5834\u304c $0$ \u3068\u306a\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3057\u305f\u306e\u3067\uff0c$x=-4$ \u306e\u4f4d\u7f6e\u306b\u304a\u3051\u308b $V(x)$ \u306e\u30b0\u30e9\u30d5\u306e\u50be\u304d\u306f $0$ \u3067\u3059\uff01<\/p>\n\n\n\n
\u4ee5\u4e0a\u3092\u8e0f\u307e\u3048\u3066\u30b0\u30e9\u30d5\u3092\u304b\u304f\u3068\uff0c\u56f3\u306e\u3088\u3046\u306a\u6982\u5f62\u304c\u5f97\u3089\u308c\u307e\u3059\u3002<\/p>\n\n\n<\/noscript><\/figure>\n\n\n\n\u30b0\u30e9\u30d5\u306e\u5f62\u81ea\u4f53\u306f\u8907\u96d1\u3067\u3059\u304c\uff0c3\u3064\u306e\u6027\u8cea\u306b\u6ce8\u76ee\u3059\u308b\u3053\u3068\u3067\uff0c\u5fae\u5206\u3059\u308b\u3053\u3068\u306a\u304f\u30b0\u30e9\u30d5\u306e\u6982\u5f62\u3092\u77e5\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u3059\u3002<\/p>\n\n\n\n<\/noscript>\u7fbd\u767d<\/div><\/div>\n\u3053\u308c\u3063\u3066\u51c4\u304f\u306a\u3044\u3067\u3059\u304b\u2026\uff1f<\/p>\n<\/div><\/div><\/div><\/div>\n\n\n\n\u305b\u3063\u304b\u304f\u30b0\u30e9\u30d5\u306e\u6982\u5f62\u3092\u304b\u3044\u305f\u306e\u3067\uff0c\u3053\u308c\u3092\u5229\u7528\u3057\u305f\u554f\u984c\u3092\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n \n \n \n \n <\/i> \u4f8b\u984c\n <\/span>\n <\/p>\n\n \n \u4e0a\u306e\u4f8b\u984c\u3067\u6271\u3063\u305f\u96fb\u4f4d\u3068\u540c\u3058\u3088\u3046\u306b\u96fb\u8377\u3092\u914d\u7f6e\u3059\u308b\u3002$x$ \u8ef8\u4e0a\u306e\u8ca0\u306e\u65b9\u5411\u306e\u7121\u9650\u9060\u65b9\u306b $+Q$ \u306e\u96fb\u8377\u3092\u305d\u3063\u3068\u304a\u3044\u305f\u3068\u304d\uff0c\u3053\u306e\u96fb\u8377\u306f\u3069\u306e\u3088\u3046\u306a\u904b\u52d5\u3092\u3059\u308b\u304b\u3002<\/p>\n <\/div>\n <\/div>\n\n\n\n\u89e3\u304d\u65b9<\/h3>\n\n\n\n\u96fb\u8377\u306e\u52d5\u304d\u3092\u8003\u3048\u308b\u969b\u306b\u306f\u300c\u96fb\u4f4d\u306e\u30b0\u30e9\u30d5\u3092\u5742\u9053\u3068\u3057\u3066\u8003\u3048\u308b\u3068\u4fbf\u5229\u300d\u3067\u3057\u305f\u3002<\/p>\n\n\n\n\u4eca\u56de\u306f\u8ca0\u306e\u7121\u9650\u9060\u65b9\u306b\u96fb\u8377\u3092\u914d\u7f6e\u3057\u3066\u3044\u307e\u3059\u304c\uff0c$x\\to-\\infty$ \u3067 $V(x)\\to0$ \u3067\u3059\u306e\u3067\uff0c\u9ad8\u3055 0 \u306e\u3068\u3053\u308d\u304b\u3089\u5742\u9053\u3092\u8ee2\u304c\u308a\u59cb\u3081\u307e\u3059\u3002<\/p>\n\n\n\n<\/div>\n\n\n\n\u901f\u3055\u304c\u6700\u5927\u306b\u306a\u308b\u306e\u306f\u8c37\u5e95\u306e\u90e8\u5206\u3067\u3059\u3002\u30b0\u30e9\u30d5\u306e\u6982\u5f62\u304b\u3089\uff0c$x=-4$ \u306e\u4f4d\u7f6e\u3060\u3068\u3059\u3050\u306b\u308f\u304b\u308a\u307e\u3059\u306d\u3002<\/p>\n\n\n\n\u96fb\u8377\u306e\u8cea\u91cf\u3092 $m$\uff0c$x=-4$ \u306e\u4f4d\u7f6e\u306b\u304a\u3051\u308b\u96fb\u8377\u306e\u901f\u3055\u3092 $v$ \u3068\u3059\u308c\u3070\uff0c\u30a8\u30cd\u30eb\u30ae\u30fc\u4fdd\u5b58\u5247\u3088\u308a\uff0c<\/p>\n\n\n\n$$0=\\bun12mv^2+\\left(k\\bun{Qq}{|-4|}-k\\bun{4Qq}{|-4-4|}\\right)$$<\/p>\n\n\n\n\u304c\u6210\u7acb\u3057\u307e\u3059\u3002\u3053\u308c\u3092\u89e3\u304f\u3053\u3068\u3067\uff0c<\/p>\n\n\n\n$$v=\\sqrt{\\bun{kQq}{2m}}$$<\/p>\n\n\n\n\u304c\u5f97\u3089\u308c\u307e\u3059\u306d\u3002<\/p>\n\n\n\n<\/div>\n\n\n\n$x=-4$ \u3092\u901a\u308a\u904e\u304e\u308b\u3068\uff0c\u96fb\u8377\u306f\u5742\u9053\u3092\u767b\u308a\u306f\u3058\u3081\u307e\u3059\u3002<\/p>\n\n\n\n\u767b\u308c\u308b\u9ad8\u3055\u306f\u30b9\u30bf\u30fc\u30c8\u5730\u70b9\u3068\u540c\u3058 $V(x)=0$ \u306e\u3068\u3053\u308d\u307e\u3067\u3067\u3059\u306e\u3067\uff0c$x=-\\bun43$ \u306e\u4f4d\u7f6e\u307e\u3067\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u306e\u70b9\u3067\u6298\u308a\u8fd4\u3057\u3066\uff0c\u518d\u3073 $x\\to-\\infty$ \u307e\u3067\u8ee2\u304c\u3063\u3066\u3044\u304f\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n\u25b6 \u96fb\u5834\u3068\u96fb\u4f4d\u30b7\u30ea\u30fc\u30ba\u306e\u5b66\u7fd2\u9806\u30ac\u30a4\u30c9\u30fb\u8981\u70b9\u6574\u7406\u306f\u3053\u3061\u3089<\/strong><\/p>\n\n\n\n\u96fb\u5834\u3068\u96fb\u4f4d\u306e\u307e\u3068\u3081\u3010\u5b66\u7fd2\u30ed\u30fc\u30c9\u30de\u30c3\u30d7\u3011<\/div>\u96fb\u5834\u3068\u96fb\u4f4d\u306e\u9055\u3044\u3068\u4f7f\u3044\u5206\u3051\u30fb\u70b9\u96fb\u8377\u306e\u5f0f\u30fb\u3064\u307e\u305a\u304d\u30dd\u30a4\u30f3\u30c8\u30921\u30da\u30fc\u30b8\u306b\u51dd\u7e2e\u3057\u305f\u5b66\u7fd2\u9806\u30ac\u30a4\u30c9\u3067\u3059\u3002<\/div>\u8a73\u3057\u304f\u898b\u308b<\/a><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"\u8907\u6570\u306e\u70b9\u96fb\u8377\u306b\u3088\u308b\u96fb\u4f4d\u3092\u30b0\u30e9\u30d5\u306e\u8db3\u3057\u5408\u308f\u305b\u3067\u6349\u3048\uff0c\u96fb\u4f4d\u304c0\u306b\u306a\u308b\u4f4d\u7f6e\u3092\u6c42\u3081\u308b\u554f\u984c\u3092\u6574\u7406\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"author":1,"featured_media":6735,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[39,23],"tags":[],"class_list":["post-6832","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-39","category-electromagnetics"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\n\t\t\n
\u30b0\u30e9\u30d5\u306e\u5f62\u81ea\u4f53\u306f\u8907\u96d1\u3067\u3059\u304c\uff0c3\u3064\u306e\u6027\u8cea\u306b\u6ce8\u76ee\u3059\u308b\u3053\u3068\u3067\uff0c\u5fae\u5206\u3059\u308b\u3053\u3068\u306a\u304f\u30b0\u30e9\u30d5\u306e\u6982\u5f62\u3092\u77e5\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u3059\u3002<\/p>\n\n\n\n
\u3053\u308c\u3063\u3066\u51c4\u304f\u306a\u3044\u3067\u3059\u304b\u2026\uff1f<\/p>\n<\/div><\/div><\/div><\/div>\n\n\n\n
\u305b\u3063\u304b\u304f\u30b0\u30e9\u30d5\u306e\u6982\u5f62\u3092\u304b\u3044\u305f\u306e\u3067\uff0c\u3053\u308c\u3092\u5229\u7528\u3057\u305f\u554f\u984c\u3092\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
\n \n <\/i> \u4f8b\u984c\n <\/span>\n <\/p>\n\n \n \u4e0a\u306e\u4f8b\u984c\u3067\u6271\u3063\u305f\u96fb\u4f4d\u3068\u540c\u3058\u3088\u3046\u306b\u96fb\u8377\u3092\u914d\u7f6e\u3059\u308b\u3002$x$ \u8ef8\u4e0a\u306e\u8ca0\u306e\u65b9\u5411\u306e\u7121\u9650\u9060\u65b9\u306b $+Q$ \u306e\u96fb\u8377\u3092\u305d\u3063\u3068\u304a\u3044\u305f\u3068\u304d\uff0c\u3053\u306e\u96fb\u8377\u306f\u3069\u306e\u3088\u3046\u306a\u904b\u52d5\u3092\u3059\u308b\u304b\u3002<\/p>\n <\/div>\n <\/div>\n\n\n\n\u89e3\u304d\u65b9<\/h3>\n\n\n\n\u96fb\u8377\u306e\u52d5\u304d\u3092\u8003\u3048\u308b\u969b\u306b\u306f\u300c\u96fb\u4f4d\u306e\u30b0\u30e9\u30d5\u3092\u5742\u9053\u3068\u3057\u3066\u8003\u3048\u308b\u3068\u4fbf\u5229\u300d\u3067\u3057\u305f\u3002<\/p>\n\n\n\n\u4eca\u56de\u306f\u8ca0\u306e\u7121\u9650\u9060\u65b9\u306b\u96fb\u8377\u3092\u914d\u7f6e\u3057\u3066\u3044\u307e\u3059\u304c\uff0c$x\\to-\\infty$ \u3067 $V(x)\\to0$ \u3067\u3059\u306e\u3067\uff0c\u9ad8\u3055 0 \u306e\u3068\u3053\u308d\u304b\u3089\u5742\u9053\u3092\u8ee2\u304c\u308a\u59cb\u3081\u307e\u3059\u3002<\/p>\n\n\n\n<\/div>\n\n\n\n\u901f\u3055\u304c\u6700\u5927\u306b\u306a\u308b\u306e\u306f\u8c37\u5e95\u306e\u90e8\u5206\u3067\u3059\u3002\u30b0\u30e9\u30d5\u306e\u6982\u5f62\u304b\u3089\uff0c$x=-4$ \u306e\u4f4d\u7f6e\u3060\u3068\u3059\u3050\u306b\u308f\u304b\u308a\u307e\u3059\u306d\u3002<\/p>\n\n\n\n\u96fb\u8377\u306e\u8cea\u91cf\u3092 $m$\uff0c$x=-4$ \u306e\u4f4d\u7f6e\u306b\u304a\u3051\u308b\u96fb\u8377\u306e\u901f\u3055\u3092 $v$ \u3068\u3059\u308c\u3070\uff0c\u30a8\u30cd\u30eb\u30ae\u30fc\u4fdd\u5b58\u5247\u3088\u308a\uff0c<\/p>\n\n\n\n$$0=\\bun12mv^2+\\left(k\\bun{Qq}{|-4|}-k\\bun{4Qq}{|-4-4|}\\right)$$<\/p>\n\n\n\n\u304c\u6210\u7acb\u3057\u307e\u3059\u3002\u3053\u308c\u3092\u89e3\u304f\u3053\u3068\u3067\uff0c<\/p>\n\n\n\n$$v=\\sqrt{\\bun{kQq}{2m}}$$<\/p>\n\n\n\n\u304c\u5f97\u3089\u308c\u307e\u3059\u306d\u3002<\/p>\n\n\n\n<\/div>\n\n\n\n$x=-4$ \u3092\u901a\u308a\u904e\u304e\u308b\u3068\uff0c\u96fb\u8377\u306f\u5742\u9053\u3092\u767b\u308a\u306f\u3058\u3081\u307e\u3059\u3002<\/p>\n\n\n\n\u767b\u308c\u308b\u9ad8\u3055\u306f\u30b9\u30bf\u30fc\u30c8\u5730\u70b9\u3068\u540c\u3058 $V(x)=0$ \u306e\u3068\u3053\u308d\u307e\u3067\u3067\u3059\u306e\u3067\uff0c$x=-\\bun43$ \u306e\u4f4d\u7f6e\u307e\u3067\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u306e\u70b9\u3067\u6298\u308a\u8fd4\u3057\u3066\uff0c\u518d\u3073 $x\\to-\\infty$ \u307e\u3067\u8ee2\u304c\u3063\u3066\u3044\u304f\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n\u25b6 \u96fb\u5834\u3068\u96fb\u4f4d\u30b7\u30ea\u30fc\u30ba\u306e\u5b66\u7fd2\u9806\u30ac\u30a4\u30c9\u30fb\u8981\u70b9\u6574\u7406\u306f\u3053\u3061\u3089<\/strong><\/p>\n\n\n\n\u96fb\u5834\u3068\u96fb\u4f4d\u306e\u307e\u3068\u3081\u3010\u5b66\u7fd2\u30ed\u30fc\u30c9\u30de\u30c3\u30d7\u3011<\/div>\u96fb\u5834\u3068\u96fb\u4f4d\u306e\u9055\u3044\u3068\u4f7f\u3044\u5206\u3051\u30fb\u70b9\u96fb\u8377\u306e\u5f0f\u30fb\u3064\u307e\u305a\u304d\u30dd\u30a4\u30f3\u30c8\u30921\u30da\u30fc\u30b8\u306b\u51dd\u7e2e\u3057\u305f\u5b66\u7fd2\u9806\u30ac\u30a4\u30c9\u3067\u3059\u3002<\/div>\u8a73\u3057\u304f\u898b\u308b<\/a><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"\u8907\u6570\u306e\u70b9\u96fb\u8377\u306b\u3088\u308b\u96fb\u4f4d\u3092\u30b0\u30e9\u30d5\u306e\u8db3\u3057\u5408\u308f\u305b\u3067\u6349\u3048\uff0c\u96fb\u4f4d\u304c0\u306b\u306a\u308b\u4f4d\u7f6e\u3092\u6c42\u3081\u308b\u554f\u984c\u3092\u6574\u7406\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"author":1,"featured_media":6735,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[39,23],"tags":[],"class_list":["post-6832","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-39","category-electromagnetics"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\n\t\t\n
\u4e0a\u306e\u4f8b\u984c\u3067\u6271\u3063\u305f\u96fb\u4f4d\u3068\u540c\u3058\u3088\u3046\u306b\u96fb\u8377\u3092\u914d\u7f6e\u3059\u308b\u3002$x$ \u8ef8\u4e0a\u306e\u8ca0\u306e\u65b9\u5411\u306e\u7121\u9650\u9060\u65b9\u306b $+Q$ \u306e\u96fb\u8377\u3092\u305d\u3063\u3068\u304a\u3044\u305f\u3068\u304d\uff0c\u3053\u306e\u96fb\u8377\u306f\u3069\u306e\u3088\u3046\u306a\u904b\u52d5\u3092\u3059\u308b\u304b\u3002<\/p>\n <\/div>\n <\/div>\n\n\n\n
\u96fb\u8377\u306e\u52d5\u304d\u3092\u8003\u3048\u308b\u969b\u306b\u306f\u300c\u96fb\u4f4d\u306e\u30b0\u30e9\u30d5\u3092\u5742\u9053\u3068\u3057\u3066\u8003\u3048\u308b\u3068\u4fbf\u5229\u300d\u3067\u3057\u305f\u3002<\/p>\n\n\n\n
\u4eca\u56de\u306f\u8ca0\u306e\u7121\u9650\u9060\u65b9\u306b\u96fb\u8377\u3092\u914d\u7f6e\u3057\u3066\u3044\u307e\u3059\u304c\uff0c$x\\to-\\infty$ \u3067 $V(x)\\to0$ \u3067\u3059\u306e\u3067\uff0c\u9ad8\u3055 0 \u306e\u3068\u3053\u308d\u304b\u3089\u5742\u9053\u3092\u8ee2\u304c\u308a\u59cb\u3081\u307e\u3059\u3002<\/p>\n\n\n\n
\u901f\u3055\u304c\u6700\u5927\u306b\u306a\u308b\u306e\u306f\u8c37\u5e95\u306e\u90e8\u5206\u3067\u3059\u3002\u30b0\u30e9\u30d5\u306e\u6982\u5f62\u304b\u3089\uff0c$x=-4$ \u306e\u4f4d\u7f6e\u3060\u3068\u3059\u3050\u306b\u308f\u304b\u308a\u307e\u3059\u306d\u3002<\/p>\n\n\n\n
\u96fb\u8377\u306e\u8cea\u91cf\u3092 $m$\uff0c$x=-4$ \u306e\u4f4d\u7f6e\u306b\u304a\u3051\u308b\u96fb\u8377\u306e\u901f\u3055\u3092 $v$ \u3068\u3059\u308c\u3070\uff0c\u30a8\u30cd\u30eb\u30ae\u30fc\u4fdd\u5b58\u5247\u3088\u308a\uff0c<\/p>\n\n\n\n
$$0=\\bun12mv^2+\\left(k\\bun{Qq}{|-4|}-k\\bun{4Qq}{|-4-4|}\\right)$$<\/p>\n\n\n\n
\u304c\u6210\u7acb\u3057\u307e\u3059\u3002\u3053\u308c\u3092\u89e3\u304f\u3053\u3068\u3067\uff0c<\/p>\n\n\n\n
$$v=\\sqrt{\\bun{kQq}{2m}}$$<\/p>\n\n\n\n
\u304c\u5f97\u3089\u308c\u307e\u3059\u306d\u3002<\/p>\n\n\n\n
$x=-4$ \u3092\u901a\u308a\u904e\u304e\u308b\u3068\uff0c\u96fb\u8377\u306f\u5742\u9053\u3092\u767b\u308a\u306f\u3058\u3081\u307e\u3059\u3002<\/p>\n\n\n\n
\u767b\u308c\u308b\u9ad8\u3055\u306f\u30b9\u30bf\u30fc\u30c8\u5730\u70b9\u3068\u540c\u3058 $V(x)=0$ \u306e\u3068\u3053\u308d\u307e\u3067\u3067\u3059\u306e\u3067\uff0c$x=-\\bun43$ \u306e\u4f4d\u7f6e\u307e\u3067\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u306e\u70b9\u3067\u6298\u308a\u8fd4\u3057\u3066\uff0c\u518d\u3073 $x\\to-\\infty$ \u307e\u3067\u8ee2\u304c\u3063\u3066\u3044\u304f\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
\u25b6 \u96fb\u5834\u3068\u96fb\u4f4d\u30b7\u30ea\u30fc\u30ba\u306e\u5b66\u7fd2\u9806\u30ac\u30a4\u30c9\u30fb\u8981\u70b9\u6574\u7406\u306f\u3053\u3061\u3089<\/strong><\/p>\n\n\n\n\u96fb\u5834\u3068\u96fb\u4f4d\u306e\u307e\u3068\u3081\u3010\u5b66\u7fd2\u30ed\u30fc\u30c9\u30de\u30c3\u30d7\u3011<\/div>\u96fb\u5834\u3068\u96fb\u4f4d\u306e\u9055\u3044\u3068\u4f7f\u3044\u5206\u3051\u30fb\u70b9\u96fb\u8377\u306e\u5f0f\u30fb\u3064\u307e\u305a\u304d\u30dd\u30a4\u30f3\u30c8\u30921\u30da\u30fc\u30b8\u306b\u51dd\u7e2e\u3057\u305f\u5b66\u7fd2\u9806\u30ac\u30a4\u30c9\u3067\u3059\u3002<\/div>\u8a73\u3057\u304f\u898b\u308b<\/a><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"\u8907\u6570\u306e\u70b9\u96fb\u8377\u306b\u3088\u308b\u96fb\u4f4d\u3092\u30b0\u30e9\u30d5\u306e\u8db3\u3057\u5408\u308f\u305b\u3067\u6349\u3048\uff0c\u96fb\u4f4d\u304c0\u306b\u306a\u308b\u4f4d\u7f6e\u3092\u6c42\u3081\u308b\u554f\u984c\u3092\u6574\u7406\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"author":1,"featured_media":6735,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[39,23],"tags":[],"class_list":["post-6832","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-39","category-electromagnetics"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\n\t\t\n
\u8907\u6570\u306e\u70b9\u96fb\u8377\u306b\u3088\u308b\u96fb\u4f4d\u3092\u30b0\u30e9\u30d5\u306e\u8db3\u3057\u5408\u308f\u305b\u3067\u6349\u3048\uff0c\u96fb\u4f4d\u304c0\u306b\u306a\u308b\u4f4d\u7f6e\u3092\u6c42\u3081\u308b\u554f\u984c\u3092\u6574\u7406\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"author":1,"featured_media":6735,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[39,23],"tags":[],"class_list":["post-6832","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-39","category-electromagnetics"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\n\t\t\n
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