{"id":209431,"date":"2024-03-21T14:08:00","date_gmt":"2024-03-21T14:08:00","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%e5%91%b3\/"},"modified":"2024-05-17T15:12:36","modified_gmt":"2024-05-17T15:12:36","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%e5%91%b3","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%e5%91%b3\/","title":{"rendered":"\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u306e\u5b9a\u7406 | \u6982\u8981\u3068\u7269\u7406\u7684\u610f\u5473"},"content":{"rendered":"<p class=\"sidekick\">\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u306e\u5b9a\u7406\u306f\u3001\u96fb\u78c1\u5834\u306b\u304a\u3051\u308b\u30a8\u30cd\u30eb\u30ae\u30fc\u306e\u6d41\u308c\u3092\u8aac\u660e\u3057\u3001\u96fb\u6c17\u5de5\u5b66\u3084\u7269\u7406\u5b66\u306e\u5fdc\u7528\u306b\u5f79\u7acb\u3064\u91cd\u8981\u306a\u6cd5\u5247\u3067\u3059\u3002<\/p>\n<h2>\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u306e\u5b9a\u7406 | \u6982\u8981\u3068\u7269\u7406\u7684\u610f\u5473<\/h2>\n<p>\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u306e\u5b9a\u7406\u306f\u3001\u96fb\u78c1\u5834\u306b\u304a\u3051\u308b\u30a8\u30cd\u30eb\u30ae\u30fc\u306e\u6d41\u308c\u3092\u8aac\u660e\u3059\u308b\u91cd\u8981\u306a\u6cd5\u5247\u3067\u3059\u3002\u3053\u306e\u5b9a\u7406\u306f\u3001\u96fb\u6c17\u5de5\u5b66\u3084\u7269\u7406\u5b66\u3067\u5e83\u304f\u5fdc\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u672c\u8a18\u4e8b\u3067\u306f\u3001\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u306e\u5b9a\u7406\u306e\u57fa\u672c\u7684\u306a\u6982\u8981\u3068\u305d\u306e\u7269\u7406\u7684\u610f\u5473\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<h2>\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u306e\u5b9a\u7406\u306e\u6982\u8981<\/h2>\n<p>\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u306e\u5b9a\u7406\u306f\u3001\u30a8\u30cd\u30eb\u30ae\u30fc\u4fdd\u5b58\u306e\u6cd5\u5247\u306e\u4e00\u5f62\u614b\u3067\u3001\u7279\u306b\u96fb\u5834\u3068\u78c1\u5834\u304c\u4f5c\u308a\u51fa\u3059\u30a8\u30cd\u30eb\u30ae\u30fc\u306e\u6d41\u308c\u306b\u7126\u70b9\u3092\u5f53\u3066\u3066\u3044\u307e\u3059\u3002\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u306e\u5b9a\u7406\u306f\u6b21\u306e\u3088\u3046\u306b\u8868\u73fe\u3057\u307e\u3059\uff1a<\/p>\n<p>\n\\[ \\nabla \\cdot \\mathbf{S} + \\frac{\\partial u}{\\partial t} = -\\mathbf{J} \\cdot \\mathbf{E} \\]\n<\/p>\n<p>\u3053\u3053\u3067\u3001<\/p>\n<ul>\n<li> \\(\\mathbf{S}\\) \u306f\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u30fb\u30d9\u30af\u30c8\u30eb\u3067\u3001\u5358\u4f4d\u306f\u30ef\u30c3\u30c8\u6bce\u5e73\u65b9\u30e1\u30fc\u30c8\u30eb\uff08W\/m\u00b2\uff09\u3002\u30a8\u30cd\u30eb\u30ae\u30fc\u306e\u6d41\u308c\u3092\u793a\u3057\u307e\u3059\u3002<\/li>\n<li> \\(\\frac{\\partial u}{\\partial t}\\) \u306f\u96fb\u78c1\u30a8\u30cd\u30eb\u30ae\u30fc\u5bc6\u5ea6\u306e\u6642\u9593\u5909\u5316\u3092\u8868\u3057\u307e\u3059\u3002<\/li>\n<li> \\(\\mathbf{J}\\) \u306f\u96fb\u6d41\u5bc6\u5ea6\u30d9\u30af\u30c8\u30eb\u3067\u3042\u308a\u3001\u5358\u4f4d\u306f\u30a2\u30f3\u30da\u30a2\u6bce\u5e73\u65b9\u30e1\u30fc\u30c8\u30eb\uff08A\/m\u00b2\uff09\u3002<\/li>\n<li> \\(\\mathbf{E}\\) \u306f\u96fb\u5834\u30d9\u30af\u30c8\u30eb\u3067\u3001\u5358\u4f4d\u306f\u30dc\u30eb\u30c8\u6bce\u30e1\u30fc\u30c8\u30eb\uff08V\/m\uff09\u3002<\/li>\n<\/ul>\n<h2>\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u30fb\u30d9\u30af\u30c8\u30eb<\/h2>\n<p>\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u30fb\u30d9\u30af\u30c8\u30eb \\(\\mathbf{S}\\) \u306f\u3001\u96fb\u5834 \\(\\mathbf{E}\\) \u3068\u78c1\u5834 \\(\\mathbf{H}\\) \u306e\u30d9\u30af\u30c8\u30eb\u7a4d\uff08\u30af\u30ed\u30b9\u7a4d\uff09\u3067\u5b9a\u7fa9\u3055\u308c\u307e\u3059\uff1a<\/p>\n<p>\n\\[ \\mathbf{S} = \\mathbf{E} \\times \\mathbf{H} \\]\n<\/p>\n<p>\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u30fb\u30d9\u30af\u30c8\u30eb\u306f\u3001\u96fb\u78c1\u5834\u306b\u3088\u3063\u3066\u904b\u3070\u308c\u308b\u30a8\u30cd\u30eb\u30ae\u30fc\u306e\u6d41\u308c\u306e\u65b9\u5411\u3068\u5927\u304d\u3055\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002\u30a8\u30cd\u30eb\u30ae\u30fc\u304c\u3069\u306e\u65b9\u5411\u306b\u3069\u306e\u7a0b\u5ea6\u6d41\u308c\u308b\u304b\u3092\u8996\u899a\u7684\u306b\u7406\u89e3\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n<h2>\u7269\u7406\u7684\u610f\u5473<\/h2>\n<p>\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u306e\u5b9a\u7406\u306e\u7269\u7406\u7684\u610f\u5473\u3092\u8003\u3048\u308b\u3068\u3001\u96fb\u78c1\u5834\u306e\u4e2d\u3092\u30a8\u30cd\u30eb\u30ae\u30fc\u304c\u3069\u306e\u3088\u3046\u306b\u6d41\u308c\u308b\u304b\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002\u5177\u4f53\u7684\u306b\u306f\u4ee5\u4e0b\u306e\u70b9\u304c\u91cd\u8981\u3067\u3059\uff1a<\/p>\n<ul>\n<li><strong>\u30a8\u30cd\u30eb\u30ae\u30fc\u306e\u4fdd\u5b58\uff1a<\/strong> \u96fb\u78c1\u5834\u4e2d\u306e\u30a8\u30cd\u30eb\u30ae\u30fc\u306f\u5931\u308f\u308c\u308b\u3053\u3068\u306a\u304f\u4fdd\u5b58\u3055\u308c\u307e\u3059\u3002\u30a8\u30cd\u30eb\u30ae\u30fc\u304c\u3069\u3053\u304b\u306b\u6d41\u308c\u308b\u3068\u3059\u308c\u3070\u3001\u305d\u308c\u306f\u4ed6\u306e\u5834\u6240\u306b\u84c4\u3048\u3089\u308c\u308b\u304b\u3001\u307e\u305f\u306f\u4ed6\u306e\u5f62\u5f0f\u306b\u5909\u63db\u3055\u308c\u307e\u3059\u3002<\/li>\n<li><strong>\u30a8\u30cd\u30eb\u30ae\u30fc\u306e\u6d41\u308c\uff1a<\/strong> \u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u30fb\u30d9\u30af\u30c8\u30eb\u306f\u3001\u30a8\u30cd\u30eb\u30ae\u30fc\u306e\u7a7a\u9593\u7684\u306a\u6d41\u308c\u3092\u793a\u3057\u3066\u304a\u308a\u3001\u3053\u308c\u306b\u3088\u308a\u96fb\u78c1\u6ce2\u304c\u4f1d\u64ad\u3059\u308b\u69d8\u5b50\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/li>\n<li><strong>\u30a8\u30cd\u30eb\u30ae\u30fc\u5909\u63db\uff1a<\/strong> \u96fb\u5834\u3068\u78c1\u5834\u306e\u76f8\u4e92\u4f5c\u7528\u306b\u3088\u3063\u3066\u3001\u30a8\u30cd\u30eb\u30ae\u30fc\u304c\u96fb\u78c1\u6ce2\u3068\u3057\u3066\u4f1d\u9054\u3055\u308c\u308b\u69d8\u5b50\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/li>\n<\/ul>\n<h2>\u5fdc\u7528\u4f8b<\/h2>\n<p>\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u306e\u5b9a\u7406\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u591a\u304f\u306e\u5fdc\u7528\u4f8b\u304c\u3042\u308a\u307e\u3059\uff1a<\/p>\n<ul>\n<li><strong>\u96fb\u78c1\u6ce2\u306e\u4f1d\u64ad\uff1a<\/strong> \u96fb\u78c1\u6ce2\u304c\u3069\u306e\u3088\u3046\u306b\u30a8\u30cd\u30eb\u30ae\u30fc\u3092\u904b\u3076\u304b\u3092\u8aac\u660e\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/li>\n<li><strong>\u30a2\u30f3\u30c6\u30ca\u8a2d\u8a08\uff1a<\/strong> \u7121\u7dda\u901a\u4fe1\u306b\u304a\u3044\u3066\u3001\u30a2\u30f3\u30c6\u30ca\u3092\u901a\u3058\u3066\u30a8\u30cd\u30eb\u30ae\u30fc\u304c\u3069\u306e\u3088\u3046\u306b\u653e\u5c04\u3055\u308c\u308b\u304b\u3092\u5206\u6790\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/li>\n<li><strong>\u30a8\u30cd\u30eb\u30ae\u30fc\u7ba1\u7406\uff1a<\/strong> \u96fb\u529b\u306e\u914d\u5206\u3084\u30a8\u30cd\u30eb\u30ae\u30fc\u640d\u5931\u306e\u8a55\u4fa1\u306b\u3082\u5f79\u7acb\u3061\u307e\u3059\u3002<\/li>\n<\/ul>\n<h2>\u7d50\u8ad6<\/h2>\n<p>\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u306e\u5b9a\u7406\u306f\u3001\u96fb\u78c1\u5834\u306e\u4e2d\u3092\u30a8\u30cd\u30eb\u30ae\u30fc\u304c\u3069\u306e\u3088\u3046\u306b\u6d41\u308c\u3001\u3069\u306e\u3088\u3046\u306b\u4fdd\u5b58\u3055\u308c\u308b\u304b\u3092\u8aac\u660e\u3059\u308b\u91cd\u8981\u306a\u6cd5\u5247\u3067\u3059\u3002\u3053\u306e\u5b9a\u7406\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3067\u3001\u96fb\u78c1\u6c17\u5b66\u306e\u57fa\u672c\u6982\u5ff5\u3092\u6df1\u304f\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u307e\u305f\u3001\u5b9f\u969b\u306e\u5fdc\u7528\u306b\u304a\u3044\u3066\u3082\u591a\u304f\u306e\u5206\u91ce\u3067\u6709\u7528\u306a\u77e5\u898b\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u306e\u5b9a\u7406\u306f\u3001\u96fb\u78c1\u5834\u306b\u304a\u3051\u308b\u30a8\u30cd\u30eb\u30ae\u30fc\u306e\u6d41\u308c\u3092\u8aac\u660e\u3057\u3001\u96fb\u6c17\u5de5\u5b66\u3084\u7269\u7406\u5b66\u306e\u5fdc\u7528\u306b\u5f79\u7acb\u3064\u91cd\u8981\u306a\u6cd5\u5247\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-209431","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":"<!-- 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