{"id":209171,"date":"2024-03-21T14:06:23","date_gmt":"2024-03-21T14:06:23","guid":{"rendered":"https:\/\/www.electricity-magnetism.org\/%e3%83%9d%e3%82%a4%e3%83%b3%e3%83%86%e3%82%a3%e3%83%b3%e3%82%b0%e3%81%ae%e5%ae%9a%e7%90%86-%e6%a6%82%e8%a6%81%e3%81%a8%e7%89%a9%e7%90%86%e7%9a%84%e6%84%8f%e7%be%a9\/"},"modified":"2024-05-17T15:08:20","modified_gmt":"2024-05-17T15:08:20","slug":"%e3%83%9d%e3%82%a4%e3%83%b3%e3%83%86%e3%82%a3%e3%83%b3%e3%82%b0%e3%81%ae%e5%ae%9a%e7%90%86-%e6%a6%82%e8%a6%81%e3%81%a8%e7%89%a9%e7%90%86%e7%9a%84%e6%84%8f%e7%be%a9","status":"publish","type":"post","link":"https:\/\/www.electricity-magnetism.org\/ja\/%e3%83%9d%e3%82%a4%e3%83%b3%e3%83%86%e3%82%a3%e3%83%b3%e3%82%b0%e3%81%ae%e5%ae%9a%e7%90%86-%e6%a6%82%e8%a6%81%e3%81%a8%e7%89%a9%e7%90%86%e7%9a%84%e6%84%8f%e7%be%a9\/","title":{"rendered":"\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u306e\u5b9a\u7406 | \u6982\u8981\u3068\u7269\u7406\u7684\u610f\u7fa9"},"content":{"rendered":"

\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u306e\u5b9a\u7406\u306f\u3001\u96fb\u78c1\u5834\u306e\u30a8\u30cd\u30eb\u30ae\u30fc\u306e\u6d41\u308c\u3068\u4fdd\u5b58\u306b\u95a2\u3059\u308b\u91cd\u8981\u306a\u6cd5\u5247\u3067\u3001\u30a8\u30cd\u30eb\u30ae\u30fc\u4f1d\u9001\u3084\u96fb\u78c1\u6ce2\u306e\u4f1d\u642c\u306a\u3069\u3092\u7406\u89e3\u3059\u308b\u4e0a\u3067\u4e0d\u53ef\u6b20\u3067\u3059\u3002<\/p>\n

\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u306e\u5b9a\u7406 | \u6982\u8981\u3068\u7269\u7406\u7684\u610f\u7fa9<\/h2>\n

\u96fb\u78c1\u6c17\u5b66\u306b\u304a\u3051\u308b\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u306e\u5b9a\u7406\uff08Poynting’s Theorem\uff09\u306f\u3001\u96fb\u78c1\u5834\u304c\u30a8\u30cd\u30eb\u30ae\u30fc\u3092\u3069\u306e\u3088\u3046\u306b\u904b\u3076\u304b\u3001\u305d\u3057\u3066\u305d\u306e\u30a8\u30cd\u30eb\u30ae\u30fc\u306e\u6d41\u308c\u304c\u3069\u306e\u3088\u3046\u306b\u4fdd\u5b58\u3055\u308c\u3066\u3044\u308b\u304b\u3092\u8aac\u660e\u3059\u308b\u91cd\u8981\u306a\u5b9a\u7406\u3067\u3059\u3002\u4ee5\u4e0b\u3067\u306f\u3001\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u306e\u5b9a\u7406\u306e\u6982\u8981\u3068\u305d\u306e\u7269\u7406\u7684\u610f\u7fa9\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n

\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u306e\u5b9a\u7406\u306e\u6982\u8981<\/h2>\n

\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u306e\u5b9a\u7406\u306f\u3001\u96fb\u78c1\u5834\u306e\u30a8\u30cd\u30eb\u30ae\u30fc\u5bc6\u5ea6\u3068\u30a8\u30cd\u30eb\u30ae\u30fc\u30d5\u30ed\u30fc\u306b\u95a2\u3059\u308b\u6cd5\u5247\u3092\u8868\u73fe\u3057\u3066\u3044\u307e\u3059\u3002\u307e\u305a\u3001\u96fb\u78c1\u5834\u306e\u30a8\u30cd\u30eb\u30ae\u30fc\u5bc6\u5ea6 \\( u \\) \u306f\u4ee5\u4e0b\u306e\u5f0f\u3067\u8868\u3055\u308c\u307e\u3059\uff1a<\/p>\n

\\[ u = \\frac{1}{2} (\\epsilon_0 E^2 + \\frac{1}{\\mu_0} B^2) \\]<\/p>\n

\u3053\u3053\u3067\u3001 \\( \\epsilon_0 \\) \u306f\u771f\u7a7a\u306e\u8a98\u96fb\u7387\u3001 \\( \\mu_0 \\) \u306f\u771f\u7a7a\u306e\u900f\u78c1\u7387\u3001 \\( E \\) \u306f\u96fb\u5834\u3001\u305d\u3057\u3066 \\( B \\) \u306f\u78c1\u5834\u3067\u3059\u3002<\/p>\n

\u6b21\u306b\u3001\u30a8\u30cd\u30eb\u30ae\u30fc\u30d5\u30ed\u30fc\u3092\u8868\u3059\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u30d9\u30af\u30c8\u30eb \\( \\mathbf{S} \\) \u306f\u6b21\u306e\u5f0f\u3067\u8868\u3055\u308c\u307e\u3059\uff1a<\/p>\n

\\[ \\mathbf{S} = \\frac{1}{\\mu_0} (\\mathbf{E} \\times \\mathbf{B}) \\]<\/p>\n

\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u30d9\u30af\u30c8\u30eb\u306f\u3001\u96fb\u78c1\u30a8\u30cd\u30eb\u30ae\u30fc\u304c\u7a7a\u9593\u3092\u4ecb\u3057\u3066\u3069\u306e\u65b9\u5411\u306b\u3069\u308c\u3060\u3051\u306e\u52b9\u7387\u3067\u79fb\u52d5\u3057\u3066\u3044\u308b\u304b\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n

\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u306e\u5b9a\u7406\u306e\u5f0f<\/h2>\n

\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u306e\u5b9a\u7406\u306e\u4e00\u822c\u5f62\u306f\u6b21\u306e\u3088\u3046\u306b\u8868\u3055\u308c\u307e\u3059\uff1a<\/p>\n

\\[ \\frac{\\partial u}{\\partial t} + \\nabla \\cdot \\mathbf{S} = -\\mathbf{J} \\cdot \\mathbf{E} \\]<\/p>\n

\u3053\u3053\u3067\u3001 \\( \\frac{\\partial u}{\\partial t} \\) \u306f\u30a8\u30cd\u30eb\u30ae\u30fc\u5bc6\u5ea6\u306e\u6642\u9593\u5909\u5316\u3001 \\( \\nabla \\cdot \\mathbf{S} \\) \u306f\u30a8\u30cd\u30eb\u30ae\u30fc\u30d5\u30ed\u30fc\u306e\u767a\u6563\u3001\u305d\u3057\u3066 \\( -\\mathbf{J} \\cdot \\mathbf{E} \\) \u306f\u96fb\u6d41\u5bc6\u5ea6 \\( \\mathbf{J} \\) \u306b\u3088\u308b\u30a8\u30cd\u30eb\u30ae\u30fc\u306e\u6d88\u8cbb\uff08\u30b8\u30e5\u30fc\u30eb\u52a0\u71b1\uff09\u3092\u610f\u5473\u3057\u307e\u3059\u3002<\/p>\n

\u7269\u7406\u7684\u610f\u7fa9<\/h2>\n

\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u306e\u5b9a\u7406\u306f\u3001\u30a8\u30cd\u30eb\u30ae\u30fc\u4fdd\u5b58\u306e\u6cd5\u5247\u306b\u57fa\u3065\u3044\u3066\u304a\u308a\u3001\u96fb\u78c1\u5834\u304c\u30a8\u30cd\u30eb\u30ae\u30fc\u3092\u3069\u306e\u3088\u3046\u306b\u4f1d\u9054\u3057\u3001\u5909\u63db\u3059\u308b\u304b\u3092\u7406\u89e3\u3059\u308b\u4e0a\u3067\u975e\u5e38\u306b\u91cd\u8981\u3067\u3059\u3002\u3053\u306e\u5b9a\u7406\u306e\u7269\u7406\u7684\u610f\u7fa9\u306b\u3064\u3044\u3066\u3001\u3044\u304f\u3064\u304b\u306e\u30dd\u30a4\u30f3\u30c8\u3092\u6319\u3052\u307e\u3059\u3002<\/p>\n

\u30a8\u30cd\u30eb\u30ae\u30fc\u4fdd\u5b58<\/h3>\n

\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u306e\u5b9a\u7406\u306f\u3001\u96fb\u78c1\u30a8\u30cd\u30eb\u30ae\u30fc\u304c\u6642\u9593\u3068\u7a7a\u9593\u3092\u901a\u3058\u3066\u3069\u306e\u3088\u3046\u306b\u4fdd\u5b58\u3055\u308c\u308b\u304b\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002\u30a8\u30cd\u30eb\u30ae\u30fc\u5bc6\u5ea6\u306e\u6e1b\u5c11\u306f\u3001\u30a8\u30cd\u30eb\u30ae\u30fc\u30d5\u30ed\u30fc\u306e\u767a\u6563\u3068\u7b49\u3057\u3044\u3053\u3068\u3092\u793a\u3057\u3001\u96fb\u78c1\u5834\u306e\u30a8\u30cd\u30eb\u30ae\u30fc\u304c\u5931\u308f\u308c\u308b\u5834\u5408\u3001\u305d\u308c\u306f\u4ed6\u306e\u5f62\u614b\u306e\u30a8\u30cd\u30eb\u30ae\u30fc\u306b\u5909\u63db\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002<\/p>\n

\u96fb\u78c1\u6ce2\u306e\u4f1d\u642c<\/h3>\n

\u96fb\u78c1\u6ce2\u306e\u4f1d\u642c\u3082\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u306e\u5b9a\u7406\u3092\u901a\u3058\u3066\u7406\u89e3\u3067\u304d\u307e\u3059\u3002\u5149\u3084\u7121\u7dda\u4fe1\u53f7\u306a\u3069\u306e\u96fb\u78c1\u6ce2\u306f\u3001\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u30d9\u30af\u30c8\u30eb\u306b\u6cbf\u3063\u3066\u30a8\u30cd\u30eb\u30ae\u30fc\u3092\u904b\u3073\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u30a2\u30f3\u30c6\u30ca\u304b\u3089\u653e\u5c04\u3055\u308c\u305f\u30a8\u30cd\u30eb\u30ae\u30fc\u304c\u3069\u306e\u3088\u3046\u306b\u4f1d\u64ad\u3057\u3066\u3044\u308b\u304b\u3092\u89e3\u6790\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n

\u9001\u96fb\u7dda\u3068\u30a8\u30cd\u30eb\u30ae\u30fc\u30d5\u30ed\u30fc<\/h3>\n

\u9001\u96fb\u7dda\u306b\u304a\u3051\u308b\u30a8\u30cd\u30eb\u30ae\u30fc\u4f1d\u9001\u306e\u89e3\u6790\u306b\u3082\u3001\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u306e\u5b9a\u7406\u306f\u91cd\u8981\u3067\u3059\u3002\u96fb\u7dda\u3092\u6d41\u308c\u308b\u96fb\u6d41\u3068\u305d\u308c\u306b\u4f34\u3046\u96fb\u5834\u30fb\u78c1\u5834\u3092\u8003\u3048\u308b\u3053\u3068\u3067\u3001\u96fb\u529b\u304c\u3069\u306e\u3088\u3046\u306b\u904b\u3070\u308c\u3066\u3044\u308b\u304b\u3092\u660e\u3089\u304b\u306b\u3067\u304d\u307e\u3059\u3002<\/p>\n

\u30a8\u30cd\u30eb\u30ae\u30fc\u5909\u63db<\/h3>\n

\u30e2\u30fc\u30bf\u30fc\u3084\u767a\u96fb\u6a5f\u306a\u3069\u306e\u96fb\u6c17\u6a5f\u5668\u306b\u304a\u3051\u308b\u30a8\u30cd\u30eb\u30ae\u30fc\u5909\u63db\u30d7\u30ed\u30bb\u30b9\u3082\u3001\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u306e\u5b9a\u7406\u3092\u7528\u3044\u3066\u7406\u89e3\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u96fb\u5834\u3068\u78c1\u5834\u306e\u76f8\u4e92\u4f5c\u7528\u304c\u3001\u96fb\u6c17\u30a8\u30cd\u30eb\u30ae\u30fc\u3092\u6a5f\u68b0\u30a8\u30cd\u30eb\u30ae\u30fc\u306b\u3001\u3042\u308b\u3044\u306f\u305d\u306e\u9006\u306b\u5909\u63db\u3059\u308b\u5f79\u5272\u3092\u679c\u305f\u3057\u307e\u3059\u3002<\/p>\n

\u307e\u3068\u3081<\/h2>\n

\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u306e\u5b9a\u7406\u306f\u3001\u96fb\u78c1\u5834\u306e\u30a8\u30cd\u30eb\u30ae\u30fc\u306e\u6d41\u308c\u3068\u4fdd\u5b58\u306b\u95a2\u3059\u308b\u57fa\u790e\u7684\u306a\u6cd5\u5247\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002\u30a8\u30cd\u30eb\u30ae\u30fc\u306e\u4fdd\u5b58\u3001\u96fb\u78c1\u6ce2\u306e\u4f1d\u642c\u3001\u9001\u96fb\u7dda\u306b\u304a\u3051\u308b\u30a8\u30cd\u30eb\u30ae\u30fc\u30d5\u30ed\u30fc\u3001\u305d\u3057\u3066\u96fb\u6c17\u6a5f\u5668\u306b\u304a\u3051\u308b\u30a8\u30cd\u30eb\u30ae\u30fc\u5909\u63db\u306e\u7406\u89e3\u306b\u306f\u6b20\u304b\u305b\u306a\u3044\u91cd\u8981\u306a\u5b9a\u7406\u3067\u3059\u3002\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u306e\u5b9a\u7406\u3092\u5b66\u3076\u3053\u3068\u3067\u3001\u96fb\u78c1\u6c17\u5b66\u306e\u6982\u5ff5\u3092\u6df1\u304f\u7406\u89e3\u3057\u3001\u5b9f\u4e16\u754c\u306e\u5fdc\u7528\u306b\u5f79\u7acb\u3066\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u306e\u5b9a\u7406\u306f\u3001\u96fb\u78c1\u5834\u306e\u30a8\u30cd\u30eb\u30ae\u30fc\u306e\u6d41\u308c\u3068\u4fdd\u5b58\u306b\u95a2\u3059\u308b\u91cd\u8981\u306a\u6cd5\u5247\u3067\u3001\u30a8\u30cd\u30eb\u30ae\u30fc\u4f1d\u9001\u3084\u96fb\u78c1\u6ce2\u306e\u4f1d\u642c\u306a\u3069\u3092\u7406\u89e3\u3059\u308b\u4e0a\u3067\u4e0d\u53ef\u6b20\u3067\u3059\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_generate-full-width-content":"","footnotes":""},"categories":[96],"tags":[97],"class_list":["post-209171","post","type-post","status-publish","format-standard","hentry","category-96","tag-97","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"yoast_head":"\n\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u306e\u5b9a\u7406 | \u6982\u8981\u3068\u7269\u7406\u7684\u610f\u7fa9<\/title>\n<meta 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