{"id":209054,"date":"2024-03-21T14:05:43","date_gmt":"2024-03-21T14:05:43","guid":{"rendered":"https:\/\/www.electricity-magnetism.org\/%e7%9b%b8%e5%af%be%e9%80%8f%e7%a3%81%e7%8e%87%e3%81%ae%e5%bc%8f-%e5%ae%9a%e7%be%a9%e3%80%81%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95-%e5%bf%9c%e7%94%a8\/"},"modified":"2024-05-17T15:06:29","modified_gmt":"2024-05-17T15:06:29","slug":"%e7%9b%b8%e5%af%be%e9%80%8f%e7%a3%81%e7%8e%87%e3%81%ae%e5%bc%8f-%e5%ae%9a%e7%be%a9%e3%80%81%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95-%e5%bf%9c%e7%94%a8","status":"publish","type":"post","link":"https:\/\/www.electricity-magnetism.org\/ja\/%e7%9b%b8%e5%af%be%e9%80%8f%e7%a3%81%e7%8e%87%e3%81%ae%e5%bc%8f-%e5%ae%9a%e7%be%a9%e3%80%81%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95-%e5%bf%9c%e7%94%a8\/","title":{"rendered":"\u76f8\u5bfe\u900f\u78c1\u7387\u306e\u5f0f | \u5b9a\u7fa9\u3001\u8a08\u7b97\u65b9\u6cd5 &#038; \u5fdc\u7528"},"content":{"rendered":"<p class=\"sidekick\">\u76f8\u5bfe\u900f\u78c1\u7387\u3068\u306f\u3001\u3042\u308b\u7269\u8cea\u306e\u900f\u78c1\u7387\u3092\u771f\u7a7a\u306e\u900f\u78c1\u7387\u3067\u5272\u3063\u305f\u5024\u3067\u3042\u308a\u3001\u78c1\u5834\u306b\u5bfe\u3059\u308b\u7269\u8cea\u306e\u5fdc\u7b54\u3092\u793a\u3059\u7269\u7406\u91cf\u3067\u3059\u3002<\/p>\n<h2>\u76f8\u5bfe\u900f\u78c1\u7387\u306e\u5f0f | \u5b9a\u7fa9\u3001\u8a08\u7b97\u65b9\u6cd5 &#038; \u5fdc\u7528<\/h2>\n<p>\u76f8\u5bfe\u900f\u78c1\u7387\uff08Relative Permeability\uff09\u306f\u3001\u96fb\u6c17\u30fb\u78c1\u6c17\u306e\u5206\u91ce\u3067\u983b\u7e41\u306b\u4f7f\u7528\u3055\u308c\u308b\u91cd\u8981\u306a\u6982\u5ff5\u3067\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u76f8\u5bfe\u900f\u78c1\u7387\u306e\u5b9a\u7fa9\u3001\u8a08\u7b97\u65b9\u6cd5\u3001\u304a\u3088\u3073\u305d\u306e\u5fdc\u7528\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n<h2>\u76f8\u5bfe\u900f\u78c1\u7387\u306e\u5b9a\u7fa9<\/h2>\n<p>\u76f8\u5bfe\u900f\u78c1\u7387 \\(\\mu_r\\) \u3068\u306f\u3001\u3042\u308b\u7269\u8cea\u306e\u900f\u78c1\u7387 \\(\\mu\\) \u3092\u771f\u7a7a\u306e\u900f\u78c1\u7387 \\(\\mu_0\\) \u3067\u5272\u3063\u305f\u5024\u3067\u3059\u3002\u900f\u78c1\u7387\u3068\u306f\u3001\u7269\u8cea\u304c\u78c1\u5834\u3092\u901a\u904e\u3055\u305b\u3084\u3059\u3044\u7a0b\u5ea6\u3092\u8868\u3059\u7269\u7406\u91cf\u3067\u3059\u3002\u771f\u7a7a\u306e\u900f\u78c1\u7387 \\(\\mu_0\\) \u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5b9a\u7fa9\u3055\u308c\u307e\u3059\uff1a<\/p>\n<p>\\[<br \/>\n\\mu_0 = 4\\pi \\times 10^{-7} \\ \\text{N\/A}^2<br \/>\n\\]<\/p>\n<p>\u76f8\u5bfe\u900f\u78c1\u7387\u306f\u6b21\u306e\u5f0f\u3067\u8868\u3055\u308c\u307e\u3059\uff1a<\/p>\n<p>\\[<br \/>\n\\mu_r = \\frac{\\mu}{\\mu_0}<br \/>\n\\]<\/p>\n<h2>\u900f\u78c1\u7387\u306e\u8a08\u7b97\u65b9\u6cd5<\/h2>\n<p>\u7269\u8cea\u306e\u76f8\u5bfe\u900f\u78c1\u7387\u3092\u8a08\u7b97\u3059\u308b\u306b\u306f\u3001\u305d\u306e\u7269\u8cea\u306e\u900f\u78c1\u7387 \\(\\mu\\) \u3092\u77e5\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u900f\u78c1\u7387 \\(\\mu\\) \u306f\u5b9f\u9a13\u7684\u306b\u6c42\u3081\u308b\u304b\u3001\u3082\u3057\u304f\u306f\u6587\u732e\u5024\u3092\u5229\u7528\u3057\u307e\u3059\u3002\u305d\u306e\u5f8c\u3001\u771f\u7a7a\u306e\u900f\u78c1\u7387 \\(\\mu_0\\) \u3067\u5272\u308b\u3053\u3068\u3067\u76f8\u5bfe\u900f\u78c1\u7387 \\(\\mu_r\\) \u3092\u6c42\u3081\u307e\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001\u9244\u306e\u900f\u78c1\u7387\u304c \\(\\mu_\\text{Fe}\\) = \\(6.3 \\times 10^{-3} \\ \\text{N\/A}^2\\) \u3067\u3042\u308b\u3068\u3059\u308b\u3068\u3001\u76f8\u5bfe\u900f\u78c1\u7387\u306f\u6b21\u306e\u3088\u3046\u306b\u8a08\u7b97\u3055\u308c\u307e\u3059\uff1a<\/p>\n<p>\\[<br \/>\n\\mu_r = \\frac{\\mu_\\text{Fe}}{\\mu_0} = \\frac{6.3 \\times 10^{-3}}{4\\pi \\times 10^{-7}} \\approx 5000<br \/>\n\\]<\/p>\n<h2>\u76f8\u5bfe\u900f\u78c1\u7387\u306e\u5fdc\u7528<\/h2>\n<p>\u76f8\u5bfe\u900f\u78c1\u7387\u306f\u3055\u307e\u3056\u307e\u306a\u5206\u91ce\u3067\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u305d\u306e\u4e00\u90e8\u3067\u3059\uff1a<\/p>\n<h3>1. \u30c8\u30e9\u30f3\u30b9\u3068\u30a4\u30f3\u30c0\u30af\u30bf<\/h3>\n<p>\u30c8\u30e9\u30f3\u30b9\u3084\u30a4\u30f3\u30c0\u30af\u30bf\u306e\u30b3\u30a2\u6750\u6599\u3068\u3057\u3066\u4f7f\u7528\u3055\u308c\u308b\u7269\u8cea\u306e\u76f8\u5bfe\u900f\u78c1\u7387\u306f\u3001\u30c7\u30d0\u30a4\u30b9\u306e\u52b9\u7387\u3084\u6027\u80fd\u306b\u5927\u304d\u306a\u5f71\u97ff\u3092\u4e0e\u3048\u307e\u3059\u3002\u9ad8\u3044\u76f8\u5bfe\u900f\u78c1\u7387\u3092\u6301\u3064\u6750\u6599\u306f\u3001\u78c1\u5834\u3092\u5f37\u304f\u3059\u308b\u80fd\u529b\u304c\u9ad8\u3044\u305f\u3081\u3001\u3053\u308c\u3089\u306e\u30c7\u30d0\u30a4\u30b9\u3067\u9ad8\u3044\u52b9\u7387\u3092\u5b9f\u73fe\u3057\u307e\u3059\u3002<\/p>\n<h3>2. \u78c1\u6c17\u5171\u9cf4\u753b\u50cf\uff08MRI\uff09<\/h3>\n<p>MRI\u88c5\u7f6e\u306f\u5f37\u3044\u78c1\u5834\u3092\u751f\u6210\u3057\u3066\u4f53\u5185\u306e\u753b\u50cf\u3092\u64ae\u5f71\u3059\u308b\u305f\u3081\u3001\u76f8\u5bfe\u900f\u78c1\u7387\u304c\u975e\u5e38\u306b\u9ad8\u3044\u6750\u6599\u304c\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u3088\u308a\u9bae\u660e\u306a\u753b\u50cf\u3092\u5f97\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>3. \u96fb\u78c1\u6ce2\u30b7\u30fc\u30eb\u30c9<\/h3>\n<p>\u9ad8\u3044\u76f8\u5bfe\u900f\u78c1\u7387\u3092\u6301\u3064\u6750\u6599\u306f\u3001\u30ce\u30a4\u30ba\u3092\u6e1b\u5c11\u3055\u305b\u308b\u305f\u3081\u306b\u96fb\u78c1\u6ce2\u30b7\u30fc\u30eb\u30c9\u3068\u3057\u3066\u3082\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u96fb\u5b50\u6a5f\u5668\u304c\u5916\u90e8\u306e\u96fb\u78c1\u754c\u304b\u3089\u306e\u5e72\u6e09\u3092\u53d7\u3051\u306b\u304f\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n<h3>4. 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