{"id":214500,"date":"2024-08-25T01:21:03","date_gmt":"2024-08-25T01:21:03","guid":{"rendered":"https:\/\/www.electricity-magnetism.org\/?p=214500"},"modified":"2024-08-25T01:21:03","modified_gmt":"2024-08-25T01:21:03","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%e3%81%a8%e3%81%af%ef%bc%9f","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%e3%81%a8%e3%81%af%ef%bc%9f\/","title":{"rendered":"\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247\u3068\u306f\uff1f"},"content":{"rendered":"<p class=\"sidekick\">\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247\u3068\u306f\uff1f\u96fb\u6d41\u304c\u3064\u304f\u308b\u78c1\u5834\u306e\u8a08\u7b97\u65b9\u6cd5\u3092\u7406\u89e3\u3057\u3001\u78c1\u5834\u306e\u5f37\u3055\u3068\u65b9\u5411\u3092\u4e88\u6e2c\u3059\u308b\u305f\u3081\u306e\u57fa\u672c\u539f\u7406\u3092\u7c21\u5358\u306b\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<h2>\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247\u3068\u306f\uff1f<\/h2>\n<p>\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247\uff08\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u307b\u3046\u305d\u304f\uff09\u306f\u3001\u96fb\u6d41\u304c\u4f5c\u308a\u51fa\u3059\u78c1\u5834\u3092\u5b9a\u91cf\u7684\u306b\u8aac\u660e\u3059\u308b\u7269\u7406\u6cd5\u5247\u3067\u3059\u3002\u3053\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\u30661820\u5e74\u4ee3\u306b\u5b9a\u5f0f\u5316\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n<h2>\u57fa\u672c\u539f\u7406<\/h2>\n<p>\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247\u306f\u3001\u6b21\u306e\u8981\u7d20\u306b\u57fa\u3065\u3044\u3066\u3044\u307e\u3059\uff1a<\/p>\n<ul>\n<li><strong>\u96fb\u6d41<\/strong>: \u96fb\u6d41\u304c\u6d41\u308c\u308b\u5c0e\u7dda\u3084\u56de\u8def\u3002<\/li>\n<li><strong>\u8ddd\u96e2<\/strong>: \u96fb\u6d41\u304b\u3089\u89b3\u6e2c\u70b9\u307e\u3067\u306e\u8ddd\u96e2\u3002<\/li>\n<li><strong>\u89d2\u5ea6<\/strong>: \u96fb\u6d41\u306e\u65b9\u5411\u3068\u89b3\u6e2c\u70b9\u3068\u306e\u76f8\u5bfe\u7684\u306a\u914d\u7f6e\u3002<\/li>\n<\/ul>\n<p>\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247\u306e\u6570\u5f0f\u306f\u3001\u6b21\u306e\u3088\u3046\u306b\u66f8\u3051\u307e\u3059\uff1a<\/p>\n<p>\n<em>dB = \\(\\frac{\\mu_0}{4\\pi}\\) \\(\\frac{Idl \\sin \\theta}{r^2}\\)<\/em>\n<\/p>\n<p>\u3053\u3053\u3067\uff1a<\/p>\n<ul>\n<li><strong>dB<\/strong>: \u5fae\u5c0f\u306a\u78c1\u5834\u306e\u5f37\u3055\uff08\u30c6\u30b9\u30e9\u5358\u4f4d\uff09<\/li>\n<li><strong>\u03bc<sub>0<\/sub><\/strong>: \u771f\u7a7a\u306e\u900f\u78c1\u7387 (\\(4\\pi \\times 10^{-7}\\) N\/A<sup>2<\/sup>)<\/li>\n<li><strong>I<\/strong>: \u96fb\u6d41\u306e\u5927\u304d\u3055\uff08\u30a2\u30f3\u30da\u30a2\uff09<\/li>\n<li><strong>dl<\/strong>: \u5fae\u5c0f\u306a\u96fb\u6d41\u8981\u7d20\u306e\u9577\u3055\uff08\u30e1\u30fc\u30c8\u30eb\uff09<\/li>\n<li><strong>\u03b8<\/strong>: \u96fb\u6d41\u8981\u7d20\u3068\u89b3\u6e2c\u70b9\u3068\u306e\u9593\u306e\u89d2\u5ea6<\/li>\n<li><strong>r<\/strong>: \u96fb\u6d41\u8981\u7d20\u304b\u3089\u89b3\u6e2c\u70b9\u307e\u3067\u306e\u8ddd\u96e2\uff08\u30e1\u30fc\u30c8\u30eb\uff09<\/li>\n<\/ul>\n<h2>\u5b9f\u969b\u306e\u5fdc\u7528<\/h2>\n<p>\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247\u306f\u591a\u304f\u306e\u5b9f\u969b\u306e\u5fdc\u7528\u306b\u4f7f\u308f\u308c\u307e\u3059\u3002\u4f8b\u3048\u3070\uff1a<\/p>\n<ul>\n<li>\u76f4\u7dda\u96fb\u6d41: \u7121\u9650\u9577\u306e\u76f4\u7dda\u96fb\u6d41\u304c\u4f5c\u308a\u51fa\u3059\u78c1\u5834\u3092\u8a08\u7b97\u3059\u308b\u3002<\/li>\n<li>\u5186\u5f62\u30eb\u30fc\u30d7: 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