{"id":209047,"date":"2024-03-21T14:05:39","date_gmt":"2024-03-21T14:05:39","guid":{"rendered":"https:\/\/www.electricity-magnetism.org\/%e7%a3%81%e5%a0%b4%e3%81%ae%e5%85%ac%e5%bc%8f-%e8%a7%a3%e8%aa%ac%e3%80%81%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95%e3%81%a8%e5%bf%9c%e7%94%a8\/"},"modified":"2024-05-17T15:06:22","modified_gmt":"2024-05-17T15:06:22","slug":"%e7%a3%81%e5%a0%b4%e3%81%ae%e5%85%ac%e5%bc%8f-%e8%a7%a3%e8%aa%ac%e3%80%81%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95%e3%81%a8%e5%bf%9c%e7%94%a8","status":"publish","type":"post","link":"https:\/\/www.electricity-magnetism.org\/ja\/%e7%a3%81%e5%a0%b4%e3%81%ae%e5%85%ac%e5%bc%8f-%e8%a7%a3%e8%aa%ac%e3%80%81%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95%e3%81%a8%e5%bf%9c%e7%94%a8\/","title":{"rendered":"\u78c1\u5834\u306e\u516c\u5f0f | \u89e3\u8aac\u3001\u8a08\u7b97\u65b9\u6cd5\u3068\u5fdc\u7528"},"content":{"rendered":"<p class=\"sidekick\">\u78c1\u5834\u306e\u516c\u5f0f\u3068\u8a08\u7b97\u65b9\u6cd5\u3001\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247\u3084\u30a2\u30f3\u30da\u30fc\u30eb\u306e\u6cd5\u5247\u3092\u89e3\u8aac\u3057\u3001\u96fb\u78c1\u77f3\u3001\u78c1\u6c17\u8a18\u9332\u88c5\u7f6e\u3001\u533b\u7642\u6a5f\u5668\u306a\u3069\u306e\u5fdc\u7528\u4f8b\u3092\u7d39\u4ecb\u3002<\/p>\n<h2>\u78c1\u5834\u306e\u516c\u5f0f | \u89e3\u8aac\u3001\u8a08\u7b97\u65b9\u6cd5\u3068\u5fdc\u7528<\/h2>\n<p>\u78c1\u5834\u3068\u306f\u3001\u78c1\u77f3\u3084\u96fb\u6d41\u306e\u5468\u308a\u306b\u5b58\u5728\u3059\u308b\u898b\u3048\u306a\u3044\u529b\u306e\u5834\u3067\u3059\u3002\u78c1\u5834\u306e\u5f37\u3055\u3084\u5411\u304d\u3092\u5b9a\u91cf\u7684\u306b\u7406\u89e3\u3059\u308b\u305f\u3081\u306b\u3001\u78c1\u5834\u306e\u516c\u5f0f\u304c\u4f7f\u308f\u308c\u307e\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u78c1\u5834\u306e\u57fa\u672c\u7684\u306a\u516c\u5f0f\u3068\u305d\u306e\u8a08\u7b97\u65b9\u6cd5\u3001\u3055\u3089\u306b\u5b9f\u969b\u306e\u5fdc\u7528\u4f8b\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<h2>\u78c1\u5834\u306e\u57fa\u672c\u516c\u5f0f<\/h2>\n<p>\u78c1\u5834 \\( \\mathbf{B} \\) \u3092\u8a08\u7b97\u3059\u308b\u969b\u306b\u4f7f\u7528\u3055\u308c\u308b\u57fa\u672c\u7684\u306a\u516c\u5f0f\u306e\u4e00\u3064\u306f\u3001\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247\u3067\u3059\u3002\u3053\u306e\u6cd5\u5247\u306f\u96fb\u6d41\u304c\u6d41\u308c\u308b\u5c0e\u7dda\u5468\u56f2\u306e\u78c1\u5834\u3092\u6c42\u3081\u308b\u305f\u3081\u306e\u3082\u306e\u3067\u3059\u3002\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247\u306f\u6b21\u306e\u3088\u3046\u306b\u8868\u3055\u308c\u307e\u3059\uff1a<\/p>\n<pre>\n\\[ \\mathbf{B} = \\frac{\\mu_0}{4\\pi} \\int \\frac{I \\, d\\mathbf{l} \\times \\mathbf{\\hat{r}}}{r^2} \\]\n\n<\/pre>\n<p>\u3053\u3053\u3067\uff1a<\/p>\n<ul>\n<li>\\( \\mu_0 \\) \u306f\u771f\u7a7a\u306e\u900f\u78c1\u7387\uff08\u7d04 \\( 4\\pi \\times 10^{-7} \\, \\text{Tm\/A} \\) \uff09<\/li>\n<li> \\( I \\) \u306f\u96fb\u6d41\u306e\u5f37\u3055<\/li>\n<li> \\( d\\mathbf{l} \\) \u306f\u5c0f\u3055\u306a\u96fb\u6d41\u7d20\u7247<\/li>\n<li> \\( \\mathbf{\\hat{r}} \\) \u306f\u96fb\u6d41\u7d20\u7247\u304b\u3089\u89b3\u6e2c\u70b9\u307e\u3067\u306e\u5358\u4f4d\u30d9\u30af\u30c8\u30eb<\/li>\n<li> \\( r \\) \u306f\u96fb\u6d41\u7d20\u7247\u304b\u3089\u89b3\u6e2c\u70b9\u307e\u3067\u306e\u8ddd\u96e2<\/li>\n<\/ul>\n<h2>\u8a08\u7b97\u65b9\u6cd5<\/h2>\n<p>\u5177\u4f53\u7684\u306a\u4f8b\u3068\u3057\u3066\u3001\u7121\u9650\u306b\u9577\u3044\u76f4\u7dda\u72b6\u306e\u96fb\u7dda\u306e\u5468\u308a\u306e\u78c1\u5834\u3092\u8003\u3048\u307e\u3059\u3002\u30a2\u30f3\u30da\u30fc\u30eb\u306e\u6cd5\u5247\u3092\u4f7f\u3046\u3068\u3001\u6b21\u306e\u3088\u3046\u306b\u8a08\u7b97\u3067\u304d\u307e\u3059\uff1a<\/p>\n<pre>\n\\[ \\oint \\mathbf{B} \\cdot d\\mathbf{l} = \\mu_0 I \\]\n<\/pre>\n<p>\u7121\u9650\u76f4\u7dda\u96fb\u6d41\u306e\u5834\u5408\u3001\u5186\u5468\u4e0a\u306e\u3042\u308b\u70b9\u3067\u306e\u78c1\u5834\u306e\u5927\u304d\u3055 \\( B \\) \u306f\u6b21\u306e\u5f0f\u3067\u6c42\u3081\u3089\u308c\u307e\u3059\uff1a<\/p>\n<pre>\n\\[ B = \\frac{\\mu_0 I}{2\\pi r} \\]\n<\/pre>\n<p>\u3053\u3053\u3067\uff1a<\/p>\n<ul>\n<li>\\( r \\) \u306f\u96fb\u7dda\u304b\u3089\u89b3\u6e2c\u70b9\u307e\u3067\u306e\u8ddd\u96e2<\/li>\n<\/ul>\n<p>\u3053\u306e\u3088\u3046\u306b\u3001\u30a2\u30f3\u30da\u30fc\u30eb\u306e\u6cd5\u5247\u3092\u4f7f\u3046\u3053\u3068\u3067\u7c21\u5358\u306b\u78c1\u5834\u3092\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2>\u78c1\u5834\u306e\u5fdc\u7528<\/h2>\n<p>\u78c1\u5834\u306f\u3055\u307e\u3056\u307e\u306a\u5834\u9762\u3067\u5fdc\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u3001\u305d\u306e\u4e00\u90e8\u3067\u3059\uff1a<\/p>\n<h3>\u96fb\u78c1\u77f3<\/h3>\n<p>\u96fb\u6d41\u304c\u6d41\u308c\u308b\u30b3\u30a4\u30eb\uff08\u96fb\u78c1\u77f3\uff09\u306f\u3001\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247\u306b\u5f93\u3063\u3066\u78c1\u5834\u3092\u767a\u751f\u3055\u305b\u307e\u3059\u3002\u3053\u306e\u7279\u6027\u3092\u5229\u7528\u3057\u3066\u3001\u30e2\u30fc\u30bf\u30fc\u3084\u767a\u96fb\u6a5f\u306a\u3069\u306e\u96fb\u6c17\u6a5f\u68b0\u304c\u8a2d\u8a08\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3>\u78c1\u6c17\u8a18\u9332\u88c5\u7f6e<\/h3>\n<p>\u30cf\u30fc\u30c9\u30c7\u30a3\u30b9\u30af\u30c9\u30e9\u30a4\u30d6\uff08HDD\uff09\u3084\u78c1\u6c17\u30c6\u30fc\u30d7\u306a\u3069\u306e\u78c1\u6c17\u8a18\u9332\u88c5\u7f6e\u306f\u3001\u78c1\u5834\u3092\u5229\u7528\u3057\u3066\u30c7\u30fc\u30bf\u3092\u8a18\u9332\u3057\u307e\u3059\u3002\u96fb\u6d41\u306b\u3088\u3063\u3066\u78c1\u5834\u3092\u751f\u6210\u3057\u3001\u305d\u306e\u78c1\u5834\u3092\u4f7f\u3063\u3066\u30c7\u30fc\u30bf\u306e\u8aad\u307f\u66f8\u304d\u3092\u884c\u3044\u307e\u3059\u3002<\/p>\n<h3>\u533b\u7642\u6a5f\u5668<\/h3>\n<p>\u78c1\u5834\u306f\u533b\u7642\u6a5f\u5668\u306b\u3082\u5fdc\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001MRI\uff08\u78c1\u6c17\u5171\u9cf4\u753b\u50cf\u88c5\u7f6e\uff09\u306f\u5f37\u529b\u306a\u78c1\u5834\u3092\u5229\u7528\u3057\u3066\u4f53\u5185\u306e\u753b\u50cf\u3092\u64ae\u5f71\u3057\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u975e\u4fb5\u8972\u7684\u306b\u5185\u90e8\u306e\u69cb\u9020\u3092\u8a73\u7d30\u306b\u89b3\u5bdf\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>\u78c1\u5834\u306e\u516c\u5f0f\u3068\u305d\u306e\u8a08\u7b97\u65b9\u6cd5\u3001\u305d\u3057\u3066\u5177\u4f53\u7684\u306a\u5fdc\u7528\u4f8b\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002\u78c1\u5834\u306f\u96fb\u6c17\u3068\u78c1\u6c17\u306e\u57fa\u672c\u7684\u306a\u6982\u5ff5\u3067\u3042\u308a\u3001\u73fe\u4ee3\u306e\u3055\u307e\u3056\u307e\u306a\u6280\u8853\u306e\u57fa\u76e4\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u78c1\u5834\u306e\u7406\u89e3\u3092\u6df1\u3081\u308b\u3053\u3068\u3067\u3001\u3053\u308c\u3089\u306e\u6280\u8853\u306e\u539f\u7406\u3092\u3088\u308a\u826f\u304f\u77e5\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u78c1\u5834\u306e\u516c\u5f0f\u3068\u8a08\u7b97\u65b9\u6cd5\u3001\u30d3\u30aa\u30fb\u30b5\u30d0\u30fc\u30eb\u306e\u6cd5\u5247\u3084\u30a2\u30f3\u30da\u30fc\u30eb\u306e\u6cd5\u5247\u3092\u89e3\u8aac\u3057\u3001\u96fb\u78c1\u77f3\u3001\u78c1\u6c17\u8a18\u9332\u88c5\u7f6e\u3001\u533b\u7642\u6a5f\u5668\u306a\u3069\u306e\u5fdc\u7528\u4f8b\u3092\u7d39\u4ecb\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-209047","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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