{"id":143833,"date":"2024-01-14T13:22:10","date_gmt":"2024-01-14T13:22:10","guid":{"rendered":"https:\/\/www.electricity-magnetism.org\/%e9%9b%bb%e7%a3%81%e6%b3%a2%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b%e3%82%a8%e3%83%8d%e3%83%ab%e3%82%ae%e3%83%bc%e3%81%a8%e3%83%91%e3%83%af%e3%83%bc-%e9%9b%bb%e6%b0%97-%e7%a3%81%e6%b0%97\/"},"modified":"2024-02-21T20:05:07","modified_gmt":"2024-02-21T20:05:07","slug":"%e9%9b%bb%e7%a3%81%e6%b3%a2%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b%e3%82%a8%e3%83%8d%e3%83%ab%e3%82%ae%e3%83%bc%e3%81%a8%e3%83%91%e3%83%af%e3%83%bc-%e9%9b%bb%e6%b0%97-%e7%a3%81%e6%b0%97","status":"publish","type":"post","link":"https:\/\/www.electricity-magnetism.org\/ja\/%e9%9b%bb%e7%a3%81%e6%b3%a2%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b%e3%82%a8%e3%83%8d%e3%83%ab%e3%82%ae%e3%83%bc%e3%81%a8%e3%83%91%e3%83%af%e3%83%bc-%e9%9b%bb%e6%b0%97-%e7%a3%81%e6%b0%97\/","title":{"rendered":"\u96fb\u78c1\u6ce2\u306b\u304a\u3051\u308b\u30a8\u30cd\u30eb\u30ae\u30fc\u3068\u30d1\u30ef\u30fc | \u96fb\u6c17 &#8211; 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\/>\n\\[ u = \\frac{1}{2}\\epsilon E^2 + \\frac{1}{2}\\left(\\frac{1}{\\mu}\\right)H^2 \\]<br \/>\n\u3053\u3053\u3067\u3001\\(\\epsilon\\)\u306f\u5a92\u4f53\u306e\u8a98\u96fb\u7387\u3001\\(\\mu\\)\u306f\u5a92\u4f53\u306e\u900f\u78c1\u7387\u3001\\(E\\)\u3068\\(H\\)\u306f\u305d\u308c\u305e\u308c\u96fb\u5834\u3068\u78c1\u5834\u306e\u5927\u304d\u3055\u3092\u8868\u3057\u307e\u3059\u3002\u7279\u5b9a\u306e\u4f53\u7a4d\u306b\u304a\u3051\u308b\u96fb\u78c1\u6ce2\u306e\u7dcf\u30a8\u30cd\u30eb\u30ae\u30fc\u306f\u3001\u305d\u306e\u4f53\u7a4d\u306b\u308f\u305f\u308b\u30a8\u30cd\u30eb\u30ae\u30fc\u5bc6\u5ea6\u306e\u7a4d\u5206\u306b\u3088\u3063\u3066\u8a08\u7b97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2>\u96fb\u78c1\u6ce2\u306e\u30d1\u30ef\u30fc<\/h2>\n<p>\u30d1\u30ef\u30fc\u306f\u3001\u96fb\u78c1\u6ce2\u306b\u3088\u3063\u3066\u30a8\u30cd\u30eb\u30ae\u30fc\u304c\u4f1d\u9054\u3055\u308c\u308b\u901f\u5ea6\u3092\u8868\u3057\u307e\u3059\u3002\u96fb\u78c1\u6ce2\u306e\u5358\u4f4d\u9762\u7a4d\u3042\u305f\u308a\u306e\u30d1\u30ef\u30fc\u3001\u307e\u305f\u306f\u5f37\u5ea6(I)\u306f\u3001\u30a8\u30cd\u30eb\u30ae\u30fc\u6d41\u308c\u306e\u65b9\u5411\u3068\u5927\u304d\u3055\u3092\u8868\u3059\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u30d9\u30af\u30c8\u30eb(S)\u306e\u5927\u304d\u3055\u306b\u3088\u3063\u3066\u4e0e\u3048\u3089\u308c\u307e\u3059\uff1a<br \/>\n\\[ S = E \\times H \\]<br \/>\n\\[ I = |S| \\]<br \/>\n\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u30d9\u30af\u30c8\u30eb\u306f\u96fb\u5834\u3068\u78c1\u5834\u306e\u5916\u7a4d\u3067\u3042\u308a\u3001\u305d\u306e\u65b9\u5411\u306fE\u3068H\u306e\u4e21\u65b9\u306b\u5782\u76f4\u3067\u3042\u308a\u3001\u30a8\u30cd\u30eb\u30ae\u30fc\u306e\u4f1d\u64ad\u65b9\u5411\u3092\u793a\u3057\u307e\u3059\u3002\u771f\u7a7a\u307e\u305f\u306f\u81ea\u7531\u7a7a\u9593\u3067\u306f\u3001\u96fb\u78c1\u6ce2\u306e\u5f37\u5ea6\u306f\u96fb\u5834\u306e\u9805\u3067\u8868\u3055\u308c\u307e\u3059\uff1a<br \/>\n\\[ I = \\frac{1}{2}\\epsilon c E^2 \\]<br \/>\n\u3053\u3053\u3067\u3001\\(c\\)\u306f\u771f\u7a7a\u4e2d\u306e\u5149\u901f\u3067\u3059\u3002\u7279\u5b9a\u306e\u9818\u57df\u3092\u901a\u904e\u3059\u308b\u96fb\u78c1\u6ce2\u306e\u7dcf\u30d1\u30ef\u30fc\u306f\u3001\u305d\u306e\u9818\u57df\u306b\u308f\u305f\u308b\u5f37\u5ea6\u306e\u7a4d\u5206\u306b\u3088\u3063\u3066\u8a08\u7b97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br \/>\n\u3053\u308c\u3089\u306e\u6982\u5ff5\u306f\u3001\u30a2\u30f3\u30c6\u30ca\u8a2d\u8a08\u3001\u7121\u7dda\u901a\u4fe1\u3001\u30ec\u30fc\u30c0\u30fc\u30b7\u30b9\u30c6\u30e0\u3001\u30a8\u30cd\u30eb\u30ae\u30fc\u53ce\u96c6\u306a\u3069\u3001\u96fb\u78c1\u6ce2\u306e\u30a8\u30cd\u30eb\u30ae\u30fc\u3068\u30d1\u30ef\u30fc\u304c\u30b7\u30b9\u30c6\u30e0\u306e\u6027\u80fd\u3068\u52b9\u7387\u306b\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3059\u3055\u307e\u3056\u307e\u306a\u5fdc\u7528\u3067\u91cd\u8981\u3067\u3059\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.electricity-magnetism.org\/wp-content\/uploads\/2022\/01\/logo.png\" alt=\"Energy and power in electromagnetic waves\" \/><\/p>\n<div style=\"text-align: center; font-size: 20px;\">\n    <a href=\"https:\/\/www.electricity-magnetism.org\/energy-and-power-in-electromagnetic-waves\/\">Original Article<\/a>\n<\/div>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u96fb\u78c1\u6ce2\u306e\u30a8\u30cd\u30eb\u30ae\u30fc\u306f\u3001\u96fb\u5834 (E \u30d5\u30a3\u30fc\u30eb\u30c9) \u3068\u78c1\u5834 (H \u30d5\u30a3\u30fc\u30eb\u30c9) \u306e\u4e21\u65b9\u306b\u4fdd\u5b58\u3055\u308c\u307e\u3059\u3002 \u7a7a\u9593\u5185\u306e\u7279\u5b9a\u306e\u70b9\u306b\u304a\u3051\u308b\u30a8\u30cd\u30eb\u30ae\u30fc\u5bc6\u5ea6 (u) \u306f\u3001\u96fb\u5834\u306e\u30a8\u30cd\u30eb\u30ae\u30fc\u5bc6\u5ea6\u3068\u78c1\u5834\u306e\u30a8\u30cd\u30eb\u30ae\u30fc\u5bc6\u5ea6\u306e\u5408\u8a08\u3067\u3059\u3002<\/p>\n","protected":false},"author":1,"featured_media":1579,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_generate-full-width-content":"","footnotes":""},"categories":[13],"tags":[],"class_list":["post-143833","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-13","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u96fb\u78c1\u6ce2\u306b\u304a\u3051\u308b\u30a8\u30cd\u30eb\u30ae\u30fc\u3068\u30d1\u30ef\u30fc | \u96fb\u6c17 - \u78c1\u6c17<\/title>\n<meta name=\"description\" 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