{"id":214556,"date":"2024-11-28T00:42:19","date_gmt":"2024-11-28T00:42:19","guid":{"rendered":"https:\/\/www.electricity-magnetism.org\/?p=214556"},"modified":"2024-11-28T00:42:19","modified_gmt":"2024-11-28T00:42:19","slug":"%e6%b0%b8%e4%b9%85%e7%a3%81%e7%9f%b3%e3%81%ab%e3%82%88%e3%82%8b%e7%a3%81%e5%a0%b4%e3%81%ae%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.electricity-magnetism.org\/ja\/%e6%b0%b8%e4%b9%85%e7%a3%81%e7%9f%b3%e3%81%ab%e3%82%88%e3%82%8b%e7%a3%81%e5%a0%b4%e3%81%ae%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95\/","title":{"rendered":"\u6c38\u4e45\u78c1\u77f3\u306b\u3088\u308b\u78c1\u5834\u306e\u8a08\u7b97\u65b9\u6cd5"},"content":{"rendered":"<p class=\"sidekick\">\u6c38\u4e45\u78c1\u77f3\u306b\u3088\u308b\u78c1\u5834\u306e\u8a08\u7b97\u65b9\u6cd5\u3068\u305d\u306e\u57fa\u672c\u539f\u7406\u3092\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3002\u521d\u5fc3\u8005\u3067\u3082\u7406\u89e3\u3067\u304d\u308b\u30b9\u30c6\u30c3\u30d7\u30d0\u30a4\u30b9\u30c6\u30c3\u30d7\u306e\u30ac\u30a4\u30c9\u3002<\/p>\n<h2>\u6c38\u4e45\u78c1\u77f3\u306b\u3088\u308b\u78c1\u5834\u306e\u8a08\u7b97\u65b9\u6cd5<\/h2>\n<p>\u6c38\u4e45\u78c1\u77f3\u306f\u3001\u305d\u306e\u5185\u90e8\u69cb\u9020\u306b\u3088\u3063\u3066\u5e38\u306b\u78c1\u5834\u3092\u767a\u751f\u3055\u305b\u308b\u7269\u8cea\u3067\u3059\u3002\u6c38\u4e45\u78c1\u77f3\u3092\u7528\u3044\u305f\u78c1\u5834\u306e\u8a08\u7b97\u306f\u3001\u96fb\u78c1\u6c17\u5b66\u306b\u304a\u3051\u308b\u91cd\u8981\u306a\u8ab2\u984c\u306e\u4e00\u3064\u3067\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u57fa\u672c\u7684\u306a\u8a08\u7b97\u65b9\u6cd5\u3068\u305d\u306e\u7406\u8ad6\u7684\u80cc\u666f\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n<h2>\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247<\/h2>\n<p>\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247\u306f\u3001\u5b9a\u5e38\u96fb\u6d41\u304c\u4f5c\u308b\u78c1\u5834\u3092\u8a08\u7b97\u3059\u308b\u305f\u3081\u306e\u57fa\u672c\u7684\u306a\u6cd5\u5247\u3067\u3059\u3002\u3053\u308c\u306f\u3001\u96fb\u6d41\u7d20\u7247\u306b\u3088\u3063\u3066\u4f5c\u3089\u308c\u308b\u5fae\u5c0f\u306a\u78c1\u5834 <i>dB<\/i> \u3092\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u5f0f: \\( dB = \\frac{\\mu_0}{4\\pi} \\cdot \\frac{I \\cdot dl \\times \\hat{r}}{r^2} \\)<\/li>\n<li>\u3053\u3053\u3067\u3001\\(\\mu_0\\) \u306f\u771f\u7a7a\u306e\u900f\u78c1\u7387 (4\u03c0 \u00d7 10^{-7} Tm\/A) \u3067\u3059\u3002<\/li>\n<li>\\(I\\) \u306f\u96fb\u6d41\u3001\\(dl\\) \u306f\u5fae\u5c0f\u306a\u96fb\u6d41\u7d20\u7247\u3001\\(\\hat{r}\\) \u306f\u8ddd\u96e2\u30d9\u30af\u30c8\u30eb\u3001\\(r\\) \u306f\u8ddd\u96e2\u306e\u5927\u304d\u3055\u3067\u3059\u3002<\/li>\n<\/ul>\n<h2>\u30a2\u30f3\u30da\u30fc\u30eb\u306e\u6cd5\u5247<\/h2>\n<p>\u30a2\u30f3\u30da\u30fc\u30eb\u306e\u6cd5\u5247\u306f\u3001\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247\u3092\u7a4d\u5206\u5f62\u3067\u8868\u73fe\u3057\u3001\u3088\u308a\u5e83\u7bc4\u306a\u96fb\u6d41\u5206\u5e03\u306b\u3064\u3044\u3066\u306e\u78c1\u5834\u3092\u8a08\u7b97\u3059\u308b\u306e\u306b\u7528\u3044\u3089\u308c\u307e\u3059\u3002\u5f0f\u306f\u6b21\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<ul>\n<li>\u5f0f: \\( \\oint \\mathbf{B} \\cdot d\\mathbf{l} = \\mu_0 I_{enc} \\)<\/li>\n<li>\u3053\u3053\u3067\u3001\\(\\mathbf{B}\\) \u306f\u78c1\u675f\u5bc6\u5ea6\u3001\\(d\\mathbf{l}\\) \u306f\u9589\u56de\u8def\u306e\u5468\u56f2\u306e\u5fae\u5c0f\u306a\u9577\u3055\u7d20\u7247\u3001\\(I_{enc}\\) \u306f\u9589\u56de\u8def\u5185\u3092\u901a\u308b\u96fb\u6d41\u306e\u7dcf\u548c\u3067\u3059\u3002<\/li>\n<\/ul>\n<h2>\u6c38\u4e45\u78c1\u77f3\u306e\u78c1\u5834\u8a08\u7b97<\/h2>\n<p>\u6c38\u4e45\u78c1\u77f3\u306e\u5834\u5408\u3001\u57fa\u672c\u7684\u306a\u8003\u3048\u65b9\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<ol>\n<li>\u78c1\u77f3\u3092\u5c0f\u3055\u306a\u78c1\u6c17\u30e2\u30fc\u30e1\u30f3\u30c8\u306e\u96c6\u307e\u308a\u3068\u307f\u306a\u3059\u3002<\/li>\n<li>\u5404\u78c1\u6c17\u30e2\u30fc\u30e1\u30f3\u30c8\u304c\u4f5c\u308b\u78c1\u5834\u3092\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247\u3067\u8a08\u7b97\u3059\u308b\u3002<\/li>\n<li>\u5168\u3066\u306e\u78c1\u6c17\u30e2\u30fc\u30e1\u30f3\u30c8\u306b\u3088\u308b\u78c1\u5834\u3092\u7a7a\u9593\u306b\u308f\u305f\u3063\u3066\u7a4d\u5206\u3057\u3066\u6c42\u3081\u308b\u3002<\/li>\n<\/ol>\n<h2>\u78c1\u6c17\u30e2\u30fc\u30e1\u30f3\u30c8<\/h2>\n<p>\u78c1\u6c17\u30e2\u30fc\u30e1\u30f3\u30c8 \\(\\mathbf{m}\\) \u306f\u3001\u78c1\u77f3\u306e\u78c1\u529b\u306b\u95a2\u9023\u3057\u305f\u30d9\u30af\u30c8\u30eb\u91cf\u3067\u3059\u3002\u70b9\u78c1\u6c17\u30e2\u30fc\u30e1\u30f3\u30c8\u306b\u3088\u3063\u3066\u4f5c\u3089\u308c\u308b\u78c1\u5834\u306f\u6b21\u306e\u5f0f\u3067\u8868\u3055\u308c\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u5f0f: \\( \\mathbf{B} = \\frac{\\mu_0}{4\\pi} \\left( \\frac{3(\\mathbf{m} \\cdot \\hat{r})\\hat{r} &#8211; \\mathbf{m}}{r^3} \\right) \\)<\/li>\n<li>\u3053\u3053\u3067\u3001\\(\\mathbf{m}\\) \u306f\u78c1\u6c17\u30e2\u30fc\u30e1\u30f3\u30c8\u3001\\(\\hat{r}\\) \u306f\u5358\u4f4d\u30d9\u30af\u30c8\u30eb\u3001\\(r\\) \u306f\u8ddd\u96e2\u306e\u5927\u304d\u3055\u3067\u3059\u3002<\/li>\n<\/ul>\n<h2>\u6570\u5024\u8a08\u7b97\u306e\u30a2\u30d7\u30ed\u30fc\u30c1<\/h2>\n<p>\u6c38\u4e45\u78c1\u77f3\u306e\u78c1\u5834\u8a08\u7b97\u306f\u7406\u8ad6\u7684\u306b\u306f\u975e\u5e38\u306b\u8907\u96d1\u3067\u3059\u304c\u3001\u6570\u5024\u8a08\u7b97\u3092\u7528\u3044\u308b\u3053\u3068\u3067\u5177\u4f53\u7684\u306a\u7d50\u679c\u3092\u5f97\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002\u6709\u9650\u8981\u7d20\u6cd5 (FEM) \u3084\u5883\u754c\u8981\u7d20\u6cd5 (BEM) \u3068\u3044\u3063\u305f\u6570\u5024\u89e3\u6790\u624b\u6cd5\u304c\u5e83\u304f\u7528\u3044\u3089\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u6709\u9650\u8981\u7d20\u6cd5 (FEM): \u7269\u4f53\u3092\u5c0f\u3055\u306a\u8981\u7d20\u306b\u5206\u5272\u3057\u3001\u305d\u308c\u305e\u308c\u306e\u8981\u7d20\u306b\u304a\u3051\u308b\u78c1\u5834\u3092\u8a08\u7b97\u3057\u307e\u3059\u3002<\/li>\n<li>\u5883\u754c\u8981\u7d20\u6cd5 (BEM): \u554f\u984c\u306e\u5883\u754c\u6761\u4ef6\u3092\u5229\u7528\u3057\u3066\u3001\u5883\u754c\u9762\u4e0a\u3067\u306e\u78c1\u5834\u3092\u8a08\u7b97\u3057\u3001\u5168\u4f53\u306e\u78c1\u5834\u3092\u5c0e\u304d\u51fa\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<p>\u3053\u308c\u3089\u306e\u6570\u5024\u624b\u6cd5\u3092\u7528\u3044\u308b\u3053\u3068\u3067\u3001\u8907\u96d1\u306a\u5f62\u72b6\u3084\u6750\u8cea\u3092\u6301\u3064\u6c38\u4e45\u78c1\u77f3\u306e\u78c1\u5834\u3092\u6b63\u78ba\u306b\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>\u6c38\u4e45\u78c1\u77f3\u306b\u3088\u308b\u78c1\u5834\u306e\u8a08\u7b97\u306f\u3001\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247\u3084\u30a2\u30f3\u30da\u30fc\u30eb\u306e\u6cd5\u5247\u3092\u57fa\u306b\u3057\u305f\u7406\u8ad6\u3068\u3001\u6570\u5024\u8a08\u7b97\u624b\u6cd5\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u884c\u3044\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u65b9\u6cd5\u3092\u7fd2\u5f97\u3059\u308b\u3053\u3068\u3067\u3001\u3055\u307e\u3056\u307e\u306a\u78c1\u6c17\u30c7\u30d0\u30a4\u30b9\u306e\u8a2d\u8a08\u3084\u89e3\u6790\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6c38\u4e45\u78c1\u77f3\u306b\u3088\u308b\u78c1\u5834\u306e\u8a08\u7b97\u65b9\u6cd5\u3068\u305d\u306e\u57fa\u672c\u539f\u7406\u3092\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3002\u521d\u5fc3\u8005\u3067\u3082\u7406\u89e3\u3067\u304d\u308b\u30b9\u30c6\u30c3\u30d7\u30d0\u30a4\u30b9\u30c6\u30c3\u30d7\u306e\u30ac\u30a4\u30c9\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":[102],"tags":[],"class_list":["post-214556","post","type-post","status-publish","format-standard","hentry","category-102","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"yoast_head":"<!-- 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