{"id":209117,"date":"2024-03-21T14:06:04","date_gmt":"2024-03-21T14:06:04","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-2\/"},"modified":"2024-05-17T15:07:27","modified_gmt":"2024-05-17T15:07:27","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-2","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-2\/","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\u306f\u96fb\u6d41\u304c\u6d41\u308c\u308b\u5c0e\u7dda\u304c\u4f5c\u308b\u78c1\u5834\u3092\u8a08\u7b97\u3059\u308b\u305f\u3081\u306e\u516c\u5f0f\u3067\u3001\u591a\u69d8\u306a\u5fdc\u7528\u4f8b\u306b\u3088\u308a\u96fb\u78c1\u6c17\u5b66\u306e\u7406\u89e3\u304c\u6df1\u307e\u308a\u307e\u3059\u3002<\/p>\n<h2>\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247 | \u6982\u8981\u3068\u5fdc\u7528\u4f8b<\/h2>\n<p>\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247\u306f\u3001\u96fb\u78c1\u6c17\u5b66\u306e\u57fa\u672c\u7684\u306a\u6cd5\u5247\u306e\u3072\u3068\u3064\u3067\u3042\u308a\u3001\u7279\u306b\u78c1\u5834\u306e\u751f\u6210\u306b\u95a2\u3059\u308b\u91cd\u8981\u306a\u539f\u7406\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\u3066\u767a\u898b\u3055\u308c\u307e\u3057\u305f\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247\u306e\u6982\u8981\u3068\u305d\u306e\u5fdc\u7528\u4f8b\u306b\u3064\u3044\u3066\u7c21\u5358\u306b\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<h2>\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247\u306e\u6982\u8981<\/h2>\n<p>\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247\u306f\u3001\u96fb\u6d41\u304c\u6d41\u308c\u308b\u5c0e\u7dda\u304c\u4f5c\u308b\u78c1\u5834\u3092\u8a08\u7b97\u3059\u308b\u305f\u3081\u306e\u516c\u5f0f\u3067\u3059\u3002\u3053\u306e\u6cd5\u5247\u304b\u3089\u3001\u5fae\u5c0f\u306a\u96fb\u6d41\u8981\u7d20 \\((I d\\mathbf{l})\\) \u304c\u4f5c\u308b\u5fae\u5c0f\u306a\u78c1\u5834 \\(\\mathbf{dB}\\) \u3092\u6b21\u306e\u3088\u3046\u306b\u8868\u73fe\u3067\u304d\u307e\u3059\uff1a<\/p>\n<p><center>\\[\\mathbf{dB} = \\frac{\\mu_0}{4\\pi} \\frac{I d\\mathbf{l} \\times \\mathbf{\\hat{r}}}{r^2}\\]<\/center><\/p>\n<p>\u3053\u3053\u3067\uff1a<\/p>\n<ul>\n<li>\\(\\mu_0\\) \u306f\u771f\u7a7a\u306e\u900f\u78c1\u7387( \\(\\approx 4\\pi \\times 10^{-7} \\, \\text{N\/A}^2\\) )<\/li>\n<li>I \u306f\u96fb\u6d41\uff08\u30a2\u30f3\u30da\u30a2\uff09<\/li>\n<li>\\(d\\mathbf{l}\\) \u306f\u5fae\u5c0f\u306a\u5c0e\u7dda\u8981\u7d20<\/li>\n<li>\\(\\mathbf{r}\\) \u306f\u96fb\u6d41\u8981\u7d20\u304b\u3089\u89b3\u5bdf\u70b9\u307e\u3067\u306e\u8ddd\u96e2\uff08\u30e1\u30fc\u30c8\u30eb\uff09<\/li>\n<li>\\(\\mathbf{\\hat{r}}\\) \u306f\u305d\u306e\u8ddd\u96e2\u306e\u5358\u4f4d\u30d9\u30af\u30c8\u30eb<\/li>\n<\/ul>\n<p>\u3053\u306e\u5f0f\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u5c0e\u7dda\u306e\u7279\u5b9a\u306e\u5f62\u72b6\u306b\u6cbf\u3063\u3066\u7a4d\u5206\u3059\u308c\u3070\u3001\u7dcf\u5408\u7684\u306a\u78c1\u5834\u3092\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2>\u5fdc\u7528\u4f8b<\/h2>\n<h3>1. \u9577\u3044\u76f4\u7dda\u5c0e\u7dda\u306e\u5468\u308a\u306e\u78c1\u5834<\/h3>\n<p>\u76f4\u7dda\u5c0e\u7dda\u3092\u8003\u3048\u308b\u3068\u3001\u3053\u306e\u5c0e\u7dda\u3092\u53d6\u308a\u5dfb\u304f\u78c1\u5834\u306f\u5186\u5f62\u306e\u78c1\u529b\u7dda\u3092\u5f62\u6210\u3057\u307e\u3059\u3002\u3053\u308c\u3092\u30a2\u30f3\u30da\u30fc\u30eb\u306e\u6cd5\u5247\u3092\u7528\u3044\u3066\u3082\u6c42\u3081\u3089\u308c\u307e\u3059\u304c\u3001\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247\u3092\u4f7f\u3063\u3066\u3082\u8a08\u7b97\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><center>\\[B = \\frac{\\mu_0 I}{2\\pi r}\\]<\/center><\/p>\n<p>\u3053\u3053\u3067\uff1a<\/p>\n<ul>\n<li>B \u306f\u78c1\u5834\u306e\u5f37\u3055\uff08\u30c6\u30b9\u30e9\uff09<\/li>\n<li>I \u306f\u5c0e\u7dda\u3092\u6d41\u308c\u308b\u96fb\u6d41<\/li>\n<li>r \u306f\u5c0e\u7dda\u304b\u3089\u89b3\u6e2c\u70b9\u307e\u3067\u306e\u8ddd\u96e2<\/li>\n<\/ul>\n<p>\u3053\u306e\u5f0f\u306f\u3001\u9577\u3044\u76f4\u7dda\u5c0e\u7dda\u306e\u5468\u56f2\u306b\u767a\u751f\u3059\u308b\u78c1\u5834\u306e\u5f37\u3055\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3>2. \u5186\u5f62\u96fb\u6d41\u30eb\u30fc\u30d7\u306e\u4e2d\u5fc3\u306e\u78c1\u5834<\/h3>\n<p>\u5186\u5f62\u306e\u96fb\u6d41\u30eb\u30fc\u30d7\u306e\u4e2d\u5fc3\u304c\u4f5c\u308b\u78c1\u5834\u3082\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247\u3092\u7528\u3044\u3066\u8a08\u7b97\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u5834\u5408\u3001\u78c1\u5834\u306f\u6b21\u306e\u3088\u3046\u306b\u8868\u73fe\u3055\u308c\u307e\u3059\uff1a<\/p>\n<p><center>\\[B = \\frac{\\mu_0 I R^2}{2(R^2+z^2)^{3\/2}}\\]<\/center><\/p>\n<p>\u3053\u3053\u3067\uff1a<\/p>\n<ul>\n<li>B \u306f\u78c1\u5834\u306e\u5f37\u3055<\/li>\n<li>I \u306f\u30eb\u30fc\u30d7\u5185\u306e\u96fb\u6d41<\/li>\n<li>R \u306f\u30eb\u30fc\u30d7\u306e\u534a\u5f84<\/li>\n<li>z \u306f\u30eb\u30fc\u30d7\u306e\u4e2d\u5fc3\u304b\u3089\u89b3\u6e2c\u70b9\u307e\u3067\u306e\u9ad8\u3055<\/li>\n<\/ul>\n<p>\u7279\u306bz=0\u306e\u3068\u304d\uff08\u30eb\u30fc\u30d7\u306e\u4e2d\u5fc3\uff09\u3001\u78c1\u5834\u306e\u5f37\u3055\u306f\u6b21\u306e\u3088\u3046\u306b\u5358\u7d14\u5316\u3055\u308c\u307e\u3059\uff1a<\/p>\n<p><center>\\[B = \\frac{\\mu_0 I}{2R}\\]<\/center><\/p>\n<h3>3. \u76f4\u89d2\u306b\u4ea4\u308f\u308b\u96fb\u6d41\u5c0e\u7dda\u306e\u78c1\u5834<\/h3>\n<p>\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247\u306f\u3001\u3088\u308a\u8907\u96d1\u306a\u5e7e\u4f55\u5b66\u7684\u914d\u7f6e\u306b\u3082\u9069\u7528\u3067\u304d\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u76f4\u89d2\u306b\u4ea4\u308f\u308b\u4e8c\u3064\u306e\u96fb\u6d41\u5c0e\u7dda\u306e\u78c1\u5834\u3092\u8a08\u7b97\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002\u3053\u306e\u5834\u5408\u3001\u5404\u96fb\u6d41\u8981\u7d20\u304b\u3089\u306e\u78c1\u5834\u3092\u30d9\u30af\u30c8\u30eb\u3068\u3057\u3066\u52a0\u7b97\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u78c1\u5834\u306e\u7dcf\u5408\u7684\u306a\u5206\u5e03\u304c\u6c42\u3081\u3089\u308c\u307e\u3059\u3002<\/p>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247\u306f\u3001\u96fb\u6d41\u304c\u4f5c\u308b\u78c1\u5834\u3092\u7406\u89e3\u3059\u308b\u305f\u3081\u306e\u5f37\u529b\u306a\u30c4\u30fc\u30eb\u3067\u3059\u3002\u76f4\u7dda\u5c0e\u7dda\u3084\u5186\u5f62\u96fb\u6d41\u30eb\u30fc\u30d7\u3001\u8907\u96d1\u306a\u96fb\u6d41\u30d1\u30b9\u306a\u3069\u3001\u69d8\u3005\u306a\u5fdc\u7528\u4f8b\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u6cd5\u5247\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3067\u3001\u96fb\u78c1\u6c17\u5b66\u306e\u57fa\u790e\u3092\u3057\u3063\u304b\u308a\u3068\u62bc\u3055\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u3001\u3055\u3089\u306b\u9ad8\u5ea6\u306a\u96fb\u78c1\u6c17\u5b66\u306e\u6982\u5ff5\u306b\u9032\u3080\u305f\u3081\u306e\u571f\u53f0\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247\u306f\u96fb\u6d41\u304c\u6d41\u308c\u308b\u5c0e\u7dda\u304c\u4f5c\u308b\u78c1\u5834\u3092\u8a08\u7b97\u3059\u308b\u305f\u3081\u306e\u516c\u5f0f\u3067\u3001\u591a\u69d8\u306a\u5fdc\u7528\u4f8b\u306b\u3088\u308a\u96fb\u78c1\u6c17\u5b66\u306e\u7406\u89e3\u304c\u6df1\u307e\u308a\u307e\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-209117","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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