{"id":209109,"date":"2024-03-21T14:06:02","date_gmt":"2024-03-21T14:06:02","guid":{"rendered":"https:\/\/www.electricity-magnetism.org\/%e5%9c%b0%e7%a3%81%e6%b0%97%e5%8f%8c%e6%a5%b5%e5%ad%90%e3%83%a2%e3%83%bc%e3%83%a1%e3%83%b3%e3%83%88%e6%96%b9%e7%a8%8b%e5%bc%8f-%e8%a7%a3%e8%aa%ac%e3%81%a8%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95\/"},"modified":"2024-05-17T15:07:23","modified_gmt":"2024-05-17T15:07:23","slug":"%e5%9c%b0%e7%a3%81%e6%b0%97%e5%8f%8c%e6%a5%b5%e5%ad%90%e3%83%a2%e3%83%bc%e3%83%a1%e3%83%b3%e3%83%88%e6%96%b9%e7%a8%8b%e5%bc%8f-%e8%a7%a3%e8%aa%ac%e3%81%a8%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.electricity-magnetism.org\/ja\/%e5%9c%b0%e7%a3%81%e6%b0%97%e5%8f%8c%e6%a5%b5%e5%ad%90%e3%83%a2%e3%83%bc%e3%83%a1%e3%83%b3%e3%83%88%e6%96%b9%e7%a8%8b%e5%bc%8f-%e8%a7%a3%e8%aa%ac%e3%81%a8%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95\/","title":{"rendered":"\u5730\u78c1\u6c17\u53cc\u6975\u5b50\u30e2\u30fc\u30e1\u30f3\u30c8\u65b9\u7a0b\u5f0f | \u89e3\u8aac\u3068\u8a08\u7b97\u65b9\u6cd5"},"content":{"rendered":"<p class=\"sidekick\">\u5730\u78c1\u6c17\u53cc\u6975\u5b50\u30e2\u30fc\u30e1\u30f3\u30c8\u65b9\u7a0b\u5f0f\u306e\u8a73\u7d30\u306a\u89e3\u8aac\u3068\u8a08\u7b97\u65b9\u6cd5\u306b\u3064\u3044\u3066\u7d39\u4ecb\u3002\u5730\u7403\u306e\u78c1\u5834\u3092\u5b9a\u91cf\u5316\u3059\u308b\u305f\u3081\u306e\u91cd\u8981\u306a\u6570\u5f0f\u3068\u5177\u4f53\u7684\u306a\u8a08\u7b97\u30b9\u30c6\u30c3\u30d7\u3092\u89e3\u8aac\u3002<\/p>\n<h2>\u5730\u78c1\u6c17\u53cc\u6975\u5b50\u30e2\u30fc\u30e1\u30f3\u30c8\u65b9\u7a0b\u5f0f | \u89e3\u8aac\u3068\u8a08\u7b97\u65b9\u6cd5<\/h2>\n<p>\u5730\u78c1\u6c17\u53cc\u6975\u5b50\u30e2\u30fc\u30e1\u30f3\u30c8\u306f\u3001\u5730\u7403\u306e\u78c1\u5834\u306e\u91cd\u8981\u306a\u7279\u6027\u306e\u4e00\u3064\u3067\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u5730\u78c1\u6c17\u53cc\u6975\u5b50\u30e2\u30fc\u30e1\u30f3\u30c8\u65b9\u7a0b\u5f0f\u306e\u89e3\u8aac\u3068\u305d\u306e\u8a08\u7b97\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n<h2>\u5730\u78c1\u6c17\u53cc\u6975\u5b50\u30e2\u30fc\u30e1\u30f3\u30c8\u3068\u306f?<\/h2>\n<p>\u5730\u78c1\u6c17\u53cc\u6975\u5b50\u30e2\u30fc\u30e1\u30f3\u30c8\u306f\u3001\u5730\u7403\u306e\u5185\u90e8\u306e\u30c0\u30a4\u30ca\u30e2\u4f5c\u7528\u306b\u3088\u3063\u3066\u751f\u6210\u3055\u308c\u308b\u78c1\u5834\u306e\u5f37\u3055\u3068\u65b9\u5411\u3092\u8868\u3059\u30d1\u30e9\u30e1\u30fc\u30bf\u3067\u3059\u3002\u7c21\u5358\u306b\u8a00\u3046\u3068\u3001\u5730\u7403\u5168\u4f53\u3092\u4e00\u3064\u306e\u5de8\u5927\u306a\u78c1\u77f3\u306e\u53cc\u6975\u5b50\u3068\u3057\u3066\u8003\u3048\u305f\u5834\u5408\u3001\u305d\u306e\u78c1\u77f3\u306e\u78c1\u529b\u3092\u5b9a\u91cf\u5316\u3057\u305f\u3082\u306e\u304c\u5730\u78c1\u6c17\u53cc\u6975\u5b50\u30e2\u30fc\u30e1\u30f3\u30c8\u3067\u3059\u3002<\/p>\n<h2>\u5730\u78c1\u6c17\u53cc\u6975\u5b50\u30e2\u30fc\u30e1\u30f3\u30c8\u306e\u65b9\u7a0b\u5f0f<\/h2>\n<p>\u5730\u78c1\u6c17\u53cc\u6975\u5b50\u30e2\u30fc\u30e1\u30f3\u30c8 <em>M<\/em> \u306e\u57fa\u672c\u7684\u306a\u8868\u73fe\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\uff1a<\/p>\n<p>\\[<br \/>\nM = \\frac{4\\pi}{\\mu_0} R^3 B_0<br \/>\n\\]<\/p>\n<p>\u3053\u3053\u3067\u306e\u5404\u5909\u6570\u306e\u610f\u5473\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\uff1a<\/p>\n<ul>\n<li><strong>\\(\\mu_0\\)<\/strong>\uff1a\u771f\u7a7a\u306e\u900f\u78c1\u7387 (\u7d04 \\(4\\pi \\times 10^{-7} \\, T\\cdot m\/A\\))<\/li>\n<li><strong>R<\/strong>\uff1a\u5730\u7403\u306e\u534a\u5f84 (\u7d04 6,371 km)<\/li>\n<li><strong>B_0<\/strong>\uff1a\u5730\u7403\u8868\u9762\u3067\u306e\u5730\u78c1\u6c17\u306e\u5f37\u3055 (\u7d04 30 &#8211; 60 \u00b5T)<\/li>\n<\/ul>\n<h2>\u8a08\u7b97\u65b9\u6cd5\uff1a\u30b9\u30c6\u30c3\u30d7\u30d0\u30a4\u30b9\u30c6\u30c3\u30d7<\/h2>\n<p>\u6b21\u306b\u3001\u5177\u4f53\u7684\u306a\u8a08\u7b97\u65b9\u6cd5\u3092\u30b9\u30c6\u30c3\u30d7\u30d0\u30a4\u30b9\u30c6\u30c3\u30d7\u3067\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<h3>\u30b9\u30c6\u30c3\u30d71: \u5404\u5024\u3092\u78ba\u8a8d<\/h3>\n<p>\u307e\u305a\u3001\u5fc5\u8981\u306a\u30c7\u30fc\u30bf\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002\u3053\u3053\u3067\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5178\u578b\u7684\u306a\u5024\u3092\u4f7f\u7528\u3057\u307e\u3059\uff1a<\/p>\n<ul>\n<li>\u5730\u7403\u306e\u534a\u5f84 \\(R = 6.371 \\times 10^6 \\, m\\)<\/li>\n<li>\u771f\u7a7a\u306e\u900f\u78c1\u7387 \\(\\mu_0 = 4\\pi \\times 10^{-7} \\, T\\cdot m\/A\\)<\/li>\n<li>\u5730\u8868\u3067\u306e\u5730\u78c1\u6c17\u306e\u5f37\u3055 \\(B_0 = 50 \\times 10^{-6} \\, T\\) (\u4e2d\u9593\u5024\u3092\u4eee\u5b9a)<\/li>\n<\/ul>\n<h3>\u30b9\u30c6\u30c3\u30d72: \u65b9\u7a0b\u5f0f\u306b\u4ee3\u5165<\/h3>\n<p>\u6b21\u306b\u3001\u3053\u308c\u3089\u306e\u5024\u3092\u53cc\u6975\u5b50\u30e2\u30fc\u30e1\u30f3\u30c8\u306e\u65b9\u7a0b\u5f0f\u306b\u4ee3\u5165\u3057\u307e\u3059\uff1a<\/p>\n<p>\\[<br \/>\nM = \\frac{4\\pi}{4\\pi \\times 10^{-7}} \\times (6.371 \\times 10^6)^3 \\times 50 \\times 10^{-6}<br \/>\n\\]<\/p>\n<h3>\u30b9\u30c6\u30c3\u30d73: \u8a08\u7b97\u3092\u9032\u3081\u308b<\/h3>\n<p>\u5404\u30b9\u30c6\u30c3\u30d7\u306e\u8a08\u7b97\u3092\u884c\u3044\u307e\u3059\uff1a<\/p>\n<ol>\n<li>\\(\\frac{4\\pi}{4\\pi \\times 10^{-7}} = 10^7\\)<\/li>\n<li>\u5730\u7403\u306e\u534a\u5f84\u306e\u7acb\u65b9 \\( (6.371 \\times 10^6)^3 \\approx 2.58 \\times 10^{20} \\)<\/li>\n<li>\u6700\u7d42\u8a08\u7b97 \\( 10^7 \\times 2.58 \\times 10^{20} \\times 50 \\times 10^{-6} \\)<\/li>\n<\/ol>\n<p>\u3053\u308c\u3092\u8a08\u7b97\u3059\u308b\u3068\u3001<\/p>\n<p>\\[<br \/>\nM \\approx 1.29 \\times 10^{23} \\, A\\cdot m^2<br \/>\n\\]<\/p>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>\u5730\u78c1\u6c17\u53cc\u6975\u5b50\u30e2\u30fc\u30e1\u30f3\u30c8\u65b9\u7a0b\u5f0f\u3092\u7528\u3044\u308b\u3053\u3068\u3067\u3001\u5730\u7403\u306e\u78c1\u5834\u306e\u53cc\u6975\u5b50\u6210\u5206\u3092\u5b9a\u91cf\u5316\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u5fc5\u8981\u306a\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u9069\u5207\u306b\u4ee3\u5165\u3057\u3001\u5404\u30b9\u30c6\u30c3\u30d7\u3092\u4e01\u5be7\u306b\u8a08\u7b97\u3059\u308b\u3053\u3068\u3067\u3001\u5730\u78c1\u6c17\u53cc\u6975\u5b50\u30e2\u30fc\u30e1\u30f3\u30c8\u306e\u5024\u3092\u5f97\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u6982\u5ff5\u306f\u3001\u5730\u7403\u7269\u7406\u5b66\u3084\u5730\u78c1\u5b66\u306e\u7814\u7a76\u306b\u304a\u3044\u3066\u975e\u5e38\u306b\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u304c\u3001\u5730\u78c1\u6c17\u53cc\u6975\u5b50\u30e2\u30fc\u30e1\u30f3\u30c8\u306e\u7406\u89e3\u306e\u52a9\u3051\u306b\u306a\u308c\u3070\u5e78\u3044\u3067\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5730\u78c1\u6c17\u53cc\u6975\u5b50\u30e2\u30fc\u30e1\u30f3\u30c8\u65b9\u7a0b\u5f0f\u306e\u8a73\u7d30\u306a\u89e3\u8aac\u3068\u8a08\u7b97\u65b9\u6cd5\u306b\u3064\u3044\u3066\u7d39\u4ecb\u3002\u5730\u7403\u306e\u78c1\u5834\u3092\u5b9a\u91cf\u5316\u3059\u308b\u305f\u3081\u306e\u91cd\u8981\u306a\u6570\u5f0f\u3068\u5177\u4f53\u7684\u306a\u8a08\u7b97\u30b9\u30c6\u30c3\u30d7\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-209109","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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