{"id":209043,"date":"2024-03-21T14:05:39","date_gmt":"2024-03-21T14:05:39","guid":{"rendered":"https:\/\/www.electricity-magnetism.org\/%e3%83%93%e3%82%aa%e3%83%bb%e3%82%b5%e3%83%90%e3%83%bc%e3%83%ab%e3%81%ae%e6%b3%95%e5%89%87-%e6%a6%82%e8%a6%81%e3%81%a8%e5%bf%9c%e7%94%a8%e4%be%8b\/"},"modified":"2024-05-17T15:06:22","modified_gmt":"2024-05-17T15:06:22","slug":"%e3%83%93%e3%82%aa%e3%83%bb%e3%82%b5%e3%83%90%e3%83%bc%e3%83%ab%e3%81%ae%e6%b3%95%e5%89%87-%e6%a6%82%e8%a6%81%e3%81%a8%e5%bf%9c%e7%94%a8%e4%be%8b","status":"publish","type":"post","link":"https:\/\/www.electricity-magnetism.org\/ja\/%e3%83%93%e3%82%aa%e3%83%bb%e3%82%b5%e3%83%90%e3%83%bc%e3%83%ab%e3%81%ae%e6%b3%95%e5%89%87-%e6%a6%82%e8%a6%81%e3%81%a8%e5%bf%9c%e7%94%a8%e4%be%8b\/","title":{"rendered":"\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247 | \u6982\u8981\u3068\u5fdc\u7528\u4f8b"},"content":{"rendered":"<p class=\"sidekick\">\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247\u306e\u6982\u8981\u3001\u5c0e\u7dda\u306b\u6d41\u308c\u308b\u96fb\u6d41\u304c\u4f5c\u308b\u78c1\u5834\u306e\u8a08\u7b97\u65b9\u6cd5\u3001\u76f4\u7dda\u5c0e\u7dda\u3001\u5186\u5f62\u30b3\u30a4\u30eb\u3001\u30bd\u30ec\u30ce\u30a4\u30c9\u306e\u5fdc\u7528\u4f8b\u3092\u89e3\u8aac\u3002<\/p>\n<h2>\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247 | \u6982\u8981\u3068\u5fdc\u7528\u4f8b<\/h2>\n<h3>\u6982\u8981<\/h3>\n<p>\n\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247\u306f\u3001\u30d5\u30e9\u30f3\u30b9\u306e\u7269\u7406\u5b66\u8005\u30b8\u30e3\u30f3\uff1d\u30d0\u30c6\u30a3\u30b9\u30c8\u30fb\u30d3\u30aa\u3068\u30d5\u30a7\u30ea\u30c3\u30af\u30b9\u30fb\u30b5\u30d0\u30fc\u30eb\u306b\u3088\u3063\u3066\u767a\u898b\u3055\u308c\u305f\u6cd5\u5247\u3067\u3042\u308a\u3001\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\u306e\u6cd5\u5247\u306f\u3001\u30a2\u30f3\u30da\u30fc\u30eb\u306e\u6cd5\u5247\u3084\u30ac\u30a6\u30b9\u306e\u6cd5\u5247\u3068\u5171\u306b\u3001\u96fb\u78c1\u6c17\u5b66\u306e\u57fa\u790e\u3092\u5f62\u6210\u3057\u307e\u3059\u3002\n<\/p>\n<p>\n\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247\u306f\u3001\u6b21\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3055\u308c\u307e\u3059\u3002\u5fae\u5c0f\u9577\u3055\u306e\u5c0e\u7dda\u306b\u6d41\u308c\u308b\u96fb\u6d41\u304c\u4f5c\u308b\u78c1\u5834 \\( dB \\) \u306f\u3001\u5c0e\u7dda\u306e\u5fae\u5c0f\u90e8\u5206 \\( d\\mathbf{l} \\) \u306b\u5782\u76f4\u306a\u65b9\u5411\u3067\u3001\u96fb\u6d41\u306e\u5927\u304d\u3055 \\( I \\)\u3001\u5c0e\u7dda\u3068\u89b3\u6e2c\u70b9\u3068\u306e\u8ddd\u96e2 \\( r \\)\u3001\u304a\u3088\u3073\u305d\u308c\u3089\u306e\u9593\u306e\u89d2\u5ea6\u306b\u4f9d\u5b58\u3057\u307e\u3059\u3002\u5177\u4f53\u7684\u306b\u306f\u3001\u6b21\u306e\u5f0f\u3067\u8868\u3055\u308c\u307e\u3059\uff1a\n<\/p>\n<p>\n\\[ d\\mathbf{B} = \\frac{\\mu_0}{4\\pi} \\frac{I d\\mathbf{l} \\times \\mathbf{\\hat{r}}}{r^2} \\]\n<\/p>\n<p>\n\u3053\u3053\u3067\u3001<br \/>\n&#8211; \\( \\mu_0 \\) \u306f\u771f\u7a7a\u306e\u900f\u78c1\u7387\uff08\u7d04 \\( 4\\pi \\times 10^{-7} \\, \\mathrm{N\/A^2} \\)\uff09<br \/>\n&#8211; \\( I \\) \u306f\u96fb\u6d41\u306e\u5927\u304d\u3055<br \/>\n&#8211; \\( d\\mathbf{l} \\) \u306f\u5c0e\u7dda\u306e\u5fae\u5c0f\u9577\u3055<br \/>\n&#8211; \\( \\mathbf{\\hat{r}} \\) \u306f\u5c0e\u7dda\u304b\u3089\u89b3\u6e2c\u70b9\u3078\u306e\u5358\u4f4d\u30d9\u30af\u30c8\u30eb<br \/>\n&#8211; \\( r \\) \u306f\u5c0e\u7dda\u304b\u3089\u89b3\u6e2c\u70b9\u307e\u3067\u306e\u8ddd\u96e2\u3067\u3059\u3002\n<\/p>\n<h3>\u5fdc\u7528\u4f8b<\/h3>\n<h4>\u76f4\u7dda\u5c0e\u7dda\u306e\u78c1\u5834\u8a08\u7b97<\/h4>\n<p>\n\u76f4\u7dda\u5c0e\u7dda\u306b\u4e00\u5b9a\u306e\u96fb\u6d41\u304c\u6d41\u308c\u3066\u3044\u308b\u5834\u5408\u3001\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247\u3092\u7528\u3044\u3066\u3001\u305d\u306e\u5468\u308a\u306e\u78c1\u5834\u3092\u8a08\u7b97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u5c0e\u7dda\u306e\u5468\u308a\u3092\u5186\u72b6\u306b\u53d6\u308a\u56f2\u3080\u7d4c\u8def\u3092\u8003\u3048\u308b\u3068\u3001\u30a2\u30f3\u30da\u30fc\u30eb\u306e\u6cd5\u5247\u3068\u7d44\u307f\u5408\u308f\u305b\u3066\u3088\u308a\u7c21\u5358\u306b\u78c1\u5834\u3092\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\n<\/p>\n<h4>\u5186\u5f62\u30b3\u30a4\u30eb\u306e\u78c1\u5834\u8a08\u7b97<\/h4>\n<p>\n\u5358\u7d14\u306a\u5186\u5f62\u30b3\u30a4\u30eb\u306b\u96fb\u6d41\u3092\u6d41\u3059\u3068\u3001\u305d\u306e\u4e2d\u5fc3\u8ef8\u4e0a\u3067\u78c1\u5834\u304c\u5f37\u304f\u306a\u308b\u3053\u3068\u304c\u77e5\u3089\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u78c1\u5834\u306f\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247\u3092\u7528\u3044\u3066\u6570\u5024\u7684\u306b\u8a08\u7b97\u3055\u308c\u307e\u3059\u3002\u30b3\u30a4\u30eb\u306e\u534a\u5f84 \\( R \\) \u3068\u96fb\u6d41 \\( I \\) \u306b\u3088\u3063\u3066\u3001\u30b3\u30a4\u30eb\u306e\u4e2d\u5fc3\u8ef8\u4e0a\u306e\u78c1\u5834\u306f\u6b21\u306e\u3088\u3046\u306b\u8868\u3055\u308c\u307e\u3059\uff1a\n<\/p>\n<p>\n\\[ B = \\frac{\\mu_0 I R^2}{2 (R^2 + z^2)^{3\/2}} \\]\n<\/p>\n<p>\n\u3053\u3053\u3067\u3001<br \/>\n&#8211; \\( z \\) \u306f\u5c0e\u7dda\u304b\u3089\u306e\u5782\u76f4\u8ddd\u96e2\u3067\u3059\u3002\n<\/p>\n<h4>\u30bd\u30ec\u30ce\u30a4\u30c9\uff08\u30b3\u30a4\u30eb\u5f62\u72b6\u306e\u5c0e\u7dda\uff09\u306e\u78c1\u5834<\/h4>\n<p>\n\u9577\u3044\u30bd\u30ec\u30ce\u30a4\u30c9\u306e\u5185\u90e8\u306b\u304a\u3051\u308b\u78c1\u5834\u3082\u3001\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247\u3092\u5229\u7528\u3057\u3066\u8a08\u7b97\u3067\u304d\u307e\u3059\u3002\u30bd\u30ec\u30ce\u30a4\u30c9\u306e\u5185\u90e8\u306e\u78c1\u5834\u306f\u307b\u307c\u4e00\u69d8\u3067\u3042\u308a\u3001\u305d\u306e\u78c1\u5834\u306e\u5f37\u3055\u306f\u6b21\u306e\u3088\u3046\u306b\u8868\u3055\u308c\u307e\u3059\uff1a\n<\/p>\n<p>\n\\[ B = \\mu_0 n I \\]\n<\/p>\n<p>\n\u3053\u3053\u3067\u3001<br \/>\n&#8211; \\( n \\) \u306f\u5358\u4f4d\u9577\u3055\u3042\u305f\u308a\u306e\u5dfb\u6570<br \/>\n&#8211; \\( I \\) \u306f\u96fb\u6d41\u306e\u5f37\u3055\u3067\u3059\u3002\n<\/p>\n<h3>\u307e\u3068\u3081<\/h3>\n<p>\n\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247\u306f\u3001\u96fb\u6d41\u304c\u4f5c\u308a\u51fa\u3059\u78c1\u5834\u3092\u8a08\u7b97\u3059\u308b\u305f\u3081\u306e\u57fa\u672c\u7684\u304b\u3064\u975e\u5e38\u306b\u91cd\u8981\u306a\u6cd5\u5247\u3067\u3059\u3002\u305d\u306e\u5fdc\u7528\u7bc4\u56f2\u306f\u5e83\u304f\u3001\u76f4\u7dda\u5c0e\u7dda\u3084\u5186\u5f62\u30b3\u30a4\u30eb\u3001\u30bd\u30ec\u30ce\u30a4\u30c9\u306a\u3069\u3001\u3055\u307e\u3056\u307e\u306a\u5f62\u72b6\u306e\u5c0e\u7dda\u306e\u78c1\u5834\u3092\u89e3\u6790\u3059\u308b\u305f\u3081\u306b\u7528\u3044\u3089\u308c\u307e\u3059\u3002\u3053\u306e\u6cd5\u5247\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3067\u3001\u96fb\u78c1\u6c17\u5b66\u306e\u6df1\u3044\u7406\u89e3\u3068\u591a\u304f\u306e\u5b9f\u7528\u7684\u306a\u5fdc\u7528\u304c\u53ef\u80fd\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247\u306e\u6982\u8981\u3001\u5c0e\u7dda\u306b\u6d41\u308c\u308b\u96fb\u6d41\u304c\u4f5c\u308b\u78c1\u5834\u306e\u8a08\u7b97\u65b9\u6cd5\u3001\u76f4\u7dda\u5c0e\u7dda\u3001\u5186\u5f62\u30b3\u30a4\u30eb\u3001\u30bd\u30ec\u30ce\u30a4\u30c9\u306e\u5fdc\u7528\u4f8b\u3092\u89e3\u8aac\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-209043","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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