{"id":209430,"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%83%99%e3%82%af%e3%83%88%e3%83%ab-%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":"2024-05-17T15:12:36","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%83%99%e3%82%af%e3%83%88%e3%83%ab-%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%83%99%e3%82%af%e3%83%88%e3%83%ab-%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\u30d9\u30af\u30c8\u30eb | \u6982\u8981\u3068\u7269\u7406\u7684\u610f\u7fa9"},"content":{"rendered":"

\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u30d9\u30af\u30c8\u30eb\u306f\u3001\u96fb\u78c1\u30a8\u30cd\u30eb\u30ae\u30fc\u306e\u6d41\u308c\u3092\u793a\u3059\u96fb\u5834\u3068\u78c1\u5834\u306e\u76f8\u4e92\u4f5c\u7528\u3092\u7406\u89e3\u3059\u308b\u305f\u3081\u306e\u96fb\u78c1\u6c17\u5b66\u306e\u91cd\u8981\u306a\u6982\u5ff5\u3067\u3059\u3002<\/p>\n

\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u30d9\u30af\u30c8\u30eb | \u6982\u8981\u3068\u7269\u7406\u7684\u610f\u7fa9<\/h2>\n

\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u30d9\u30af\u30c8\u30eb\u306f\u3001\u96fb\u78c1\u6c17\u5b66\u306b\u304a\u3051\u308b\u91cd\u8981\u306a\u6982\u5ff5\u3067\u3001\u4f1d\u642c\u3059\u308b\u96fb\u78c1\u30a8\u30cd\u30eb\u30ae\u30fc\u306e\u6d41\u308c\u3092\u8aac\u660e\u3057\u307e\u3059\u3002\u3053\u306e\u30d9\u30af\u30c8\u30eb\u306f\u3001\u96fb\u5834\u3068\u78c1\u5834\u306e\u76f8\u4e92\u4f5c\u7528\u306b\u3088\u3063\u3066\u5f62\u6210\u3055\u308c\u308b\u30a8\u30cd\u30eb\u30ae\u30fc\u306e\u6d41\u308c\u3092\u793a\u3057\u3001\u96fb\u78c1\u6ce2\u304c\u3069\u306e\u3088\u3046\u306b\u30a8\u30cd\u30eb\u30ae\u30fc\u3092\u904b\u3076\u304b\u3092\u7406\u89e3\u3059\u308b\u305f\u3081\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002\u672c\u8a18\u4e8b\u3067\u306f\u3001\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u30d9\u30af\u30c8\u30eb\u306e\u57fa\u672c\u7684\u306a\u6982\u8981\u3068\u305d\u306e\u7269\u7406\u7684\u610f\u7fa9\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n

\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u30d9\u30af\u30c8\u30eb\u306e\u5b9a\u7fa9<\/h2>\n

\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u30d9\u30af\u30c8\u30eb (\\(\\vec{S}\\)) \u306f\u6b21\u306e\u3088\u3046\u306b\u5b9a\u7fa9\u3055\u308c\u307e\u3059\uff1a<\/p>\n

$$
\n\\vec{S} = \\frac{1}{\\mu_0} (\\vec{E} \\times \\vec{B})
\n$$<\/p>\n

\u3053\u3053\u3067\u3001\\(\\vec{E}\\) \u306f\u96fb\u5834\u3001\\(\\vec{B}\\) \u306f\u78c1\u5834\u3001\\(\\mu_0\\) \u306f\u771f\u7a7a\u306e\u900f\u78c1\u7387\u3067\u3059\u3002\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u30d9\u30af\u30c8\u30eb\u306f\u3001\u96fb\u5834\u3068\u78c1\u5834\u306e\u30d9\u30af\u30c8\u30eb\u7a4d\u306b\u3088\u3063\u3066\u6c42\u3081\u3089\u308c\u3001\u30a8\u30cd\u30eb\u30ae\u30fc\u306e\u6d41\u308c\u306e\u65b9\u5411\u3068\u5927\u304d\u3055\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n

\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u30d9\u30af\u30c8\u30eb\u306e\u7269\u7406\u7684\u610f\u7fa9<\/h2>\n

\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u30d9\u30af\u30c8\u30eb\u306b\u306f\u3044\u304f\u3064\u304b\u306e\u91cd\u8981\u306a\u7269\u7406\u7684\u610f\u7fa9\u304c\u3042\u308a\u307e\u3059\uff1a<\/p>\n

1. \u30a8\u30cd\u30eb\u30ae\u30fc\u306e\u6d41\u308c<\/h3>\n

\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u30d9\u30af\u30c8\u30eb\u306f\u3001\u96fb\u78c1\u6ce2\u304c\u7a7a\u9593\u3092\u901a\u3058\u3066\u30a8\u30cd\u30eb\u30ae\u30fc\u3092\u3069\u306e\u3088\u3046\u306b\u4f1d\u9054\u3059\u308b\u304b\u3092\u793a\u3057\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u96fb\u78c1\u6ce2\u304c\u767a\u5149\u4f53\u304b\u3089\u53d7\u5149\u4f53\u306b\u4f1d\u642c\u3059\u308b\u969b\u3001\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u30d9\u30af\u30c8\u30eb\u306f\u305d\u306e\u30a8\u30cd\u30eb\u30ae\u30fc\u306e\u6d41\u308c\u3092\u6b63\u78ba\u306b\u793a\u3057\u307e\u3059\u3002<\/p>\n

2. \u30a8\u30cd\u30eb\u30ae\u30fc\u306e\u4fdd\u5b58<\/h3>\n

\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u306e\u5b9a\u7406\u306f\u3001\u30a8\u30cd\u30eb\u30ae\u30fc\u4fdd\u5b58\u5247\u306e\u4e00\u5f62\u614b\u3067\u3042\u308a\u3001\u6b21\u306e\u3088\u3046\u306b\u8868\u3055\u308c\u307e\u3059\uff1a<\/p>\n

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

\u3053\u3053\u3067\u3001\\(u\\) \u306f\u96fb\u78c1\u5834\u306e\u30a8\u30cd\u30eb\u30ae\u30fc\u5bc6\u5ea6\u3001\\(\\vec{J}\\) \u306f\u96fb\u6d41\u5bc6\u5ea6\u3067\u3059\u3002\u3053\u306e\u5f0f\u306f\u3001\u96fb\u78c1\u30a8\u30cd\u30eb\u30ae\u30fc\u304c\u6642\u9593\u3068\u3068\u3082\u306b\u3069\u306e\u3088\u3046\u306b\u5909\u5316\u3057\u3001\u7a7a\u9593\u3092\u901a\u3058\u3066\u3069\u306e\u3088\u3046\u306b\u6d41\u308c\u308b\u304b\u3092\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n

3. \u653e\u5c04\u30a8\u30cd\u30eb\u30ae\u30fc\u306e\u8a08\u7b97<\/h3>\n

\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u30d9\u30af\u30c8\u30eb\u3092\u4f7f\u3063\u3066\u3001\u30a2\u30f3\u30c6\u30ca\u3084\u592a\u967d\u304b\u3089\u306e\u653e\u5c04\u30a8\u30cd\u30eb\u30ae\u30fc\u91cf\u3092\u8a08\u7b97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u30a2\u30f3\u30c6\u30ca\u304b\u3089\u653e\u5c04\u3055\u308c\u308b\u96fb\u529b\u306f\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u30d9\u30af\u30c8\u30eb\u306e\u8868\u9762\u7a4d\u5206\u306b\u3088\u3063\u3066\u6c42\u3081\u3089\u308c\u307e\u3059\uff1a<\/p>\n

$$
\nP = \\int_S \\vec{S} \\cdot d\\vec{A}
\n$$<\/p>\n

\u3053\u3053\u3067\u3001\\(d\\vec{A}\\) \u306f\u5fae\u5c0f\u9762\u7a4d\u30d9\u30af\u30c8\u30eb\u3067\u3059\u3002<\/p>\n

\u5fdc\u7528\u4f8b<\/h2>\n

\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u30d9\u30af\u30c8\u30eb\u306f\u591a\u5c90\u306b\u308f\u305f\u308b\u5fdc\u7528\u4f8b\u304c\u3042\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u305d\u306e\u4e00\u90e8\u3067\u3059\uff1a<\/p>\n

1. \u7121\u7dda\u901a\u4fe1<\/h3>\n

\u7121\u7dda\u901a\u4fe1\u306b\u304a\u3051\u308b\u96fb\u6ce2\u306e\u4f1d\u64ad\u306f\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u30d9\u30af\u30c8\u30eb\u306b\u3088\u3063\u3066\u89e3\u6790\u3055\u308c\u307e\u3059\u3002\u9001\u4fe1\u30a2\u30f3\u30c6\u30ca\u304b\u3089\u653e\u5c04\u3055\u308c\u308b\u30a8\u30cd\u30eb\u30ae\u30fc\u304c\u3069\u306e\u3088\u3046\u306b\u53d7\u4fe1\u30a2\u30f3\u30c6\u30ca\u306b\u5c4a\u304f\u304b\u3092\u7406\u89e3\u3059\u308b\u305f\u3081\u306b\u91cd\u8981\u3067\u3059\u3002<\/p>\n

2. \u30ec\u30fc\u30c0\u30fc<\/h3>\n

\u30ec\u30fc\u30c0\u30fc\u6280\u8853\u306b\u304a\u3044\u3066\u3001\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u30d9\u30af\u30c8\u30eb\u306f\u30a8\u30cd\u30eb\u30ae\u30fc\u306e\u53cd\u5c04\u3068\u6563\u4e71\u306e\u30d1\u30bf\u30fc\u30f3\u3092\u89e3\u6790\u3059\u308b\u305f\u3081\u306b\u4f7f\u308f\u308c\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u7269\u4f53\u306e\u8ddd\u96e2\u3084\u901f\u5ea6\u3092\u6e2c\u5b9a\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n

3. \u592a\u967d\u30a8\u30cd\u30eb\u30ae\u30fc<\/h3>\n

\u592a\u967d\u30a8\u30cd\u30eb\u30ae\u30fc\u767a\u96fb\u306b\u304a\u3044\u3066\u3001\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u30d9\u30af\u30c8\u30eb\u306f\u592a\u967d\u5149\u306e\u30a8\u30cd\u30eb\u30ae\u30fc\u5bc6\u5ea6\u3092\u8a08\u7b97\u3057\u3001\u52b9\u7387\u7684\u306a\u30a8\u30cd\u30eb\u30ae\u30fc\u53ce\u96c6\u3092\u53ef\u80fd\u306b\u3057\u307e\u3059\u3002<\/p>\n

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

\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u30d9\u30af\u30c8\u30eb\u306f\u3001\u96fb\u78c1\u6ce2\u306e\u30a8\u30cd\u30eb\u30ae\u30fc\u6d41\u308c\u3092\u7406\u89e3\u3059\u308b\u305f\u3081\u306e\u91cd\u8981\u306a\u30c4\u30fc\u30eb\u3067\u3059\u3002\u96fb\u5834\u3068\u78c1\u5834\u306e\u76f8\u4e92\u4f5c\u7528\u3092\u901a\u3058\u3066\u30a8\u30cd\u30eb\u30ae\u30fc\u304c\u3069\u306e\u3088\u3046\u306b\u4f1d\u9054\u3055\u308c\u308b\u304b\u3092\u660e\u78ba\u306b\u793a\u3059\u3053\u3068\u3067\u3001\u69d8\u3005\u306a\u5fdc\u7528\u5206\u91ce\u306b\u304a\u3044\u3066\u5f79\u7acb\u3061\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u7121\u7dda\u901a\u4fe1\u3001\u30ec\u30fc\u30c0\u30fc\u6280\u8853\u3001\u592a\u967d\u30a8\u30cd\u30eb\u30ae\u30fc\u306a\u3069\u3001\u591a\u304f\u306e\u5206\u91ce\u3067\u6280\u8853\u958b\u767a\u304c\u9032\u5c55\u3057\u3066\u3044\u307e\u3059\u3002\u96fb\u78c1\u6ce2\u306e\u30a8\u30cd\u30eb\u30ae\u30fc\u306e\u6d41\u308c\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u306f\u3001\u73fe\u4ee3\u306e\u30c6\u30af\u30ce\u30ed\u30b8\u30fc\u3092\u652f\u3048\u308b\u57fa\u672c\u7684\u306a\u77e5\u8b58\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

\u30dd\u30a4\u30f3\u30c6\u30a3\u30f3\u30b0\u30d9\u30af\u30c8\u30eb\u306f\u3001\u96fb\u78c1\u30a8\u30cd\u30eb\u30ae\u30fc\u306e\u6d41\u308c\u3092\u793a\u3059\u96fb\u5834\u3068\u78c1\u5834\u306e\u76f8\u4e92\u4f5c\u7528\u3092\u7406\u89e3\u3059\u308b\u305f\u3081\u306e\u96fb\u78c1\u6c17\u5b66\u306e\u91cd\u8981\u306a\u6982\u5ff5\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-209430","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\u30d9\u30af\u30c8\u30eb | \u6982\u8981\u3068\u7269\u7406\u7684\u610f\u7fa9<\/title>\n<meta name=\"description\" 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