{"id":2639,"date":"2022-03-26T15:55:22","date_gmt":"2022-03-26T06:55:22","guid":{"rendered":"https:\/\/home.hirosaki-u.ac.jp\/relativity\/?page_id=2639"},"modified":"2024-11-11T10:53:51","modified_gmt":"2024-11-11T01:53:51","slug":"%e5%8f%82%e8%80%83%ef%bc%9a%e9%9b%bb%e8%8d%b7%e3%81%ae%e4%bf%9d%e5%ad%98%e5%89%87","status":"publish","type":"page","link":"https:\/\/home.hirosaki-u.ac.jp\/relativity\/%e9%9b%bb%e7%a3%81%e6%b0%97%e5%ad%a6-i\/%e3%83%9e%e3%82%af%e3%82%b9%e3%82%a6%e3%82%a7%e3%83%ab%e6%96%b9%e7%a8%8b%e5%bc%8f%e3%81%ab%e7%8f%be%e3%82%8c%e3%82%8b%e8%ab%b8%e9%87%8f%e3%81%ae%e8%a7%a3%e8%aa%ac\/%e5%8f%82%e8%80%83%ef%bc%9a%e9%9b%bb%e8%8d%b7%e3%81%ae%e4%bf%9d%e5%ad%98%e5%89%87\/","title":{"rendered":"\u53c2\u8003\uff1a\u96fb\u8377\u306e\u4fdd\u5b58\u5247"},"content":{"rendered":"

<\/p>\n

\u30de\u30af\u30b9\u30a6\u30a7\u30eb\u65b9\u7a0b\u5f0f<\/h3>\n

\\begin{eqnarray}\\nabla\\cdot \\boldsymbol{D} &=& \\rho\u00a0 \\tag{1}\\\\
\n\\nabla\\cdot\\boldsymbol{B} &=& 0\u00a0 \\tag{2}\\\\
\n\\nabla\\times\\boldsymbol{E} + \\frac{\\partial \\boldsymbol{B}}{\\partial t} &=& \\boldsymbol{0}\u00a0 \\tag{3}\\\\
\n\\nabla\\times\\boldsymbol{H} – \\frac{\\partial \\boldsymbol{D}}{\\partial t} &=& \\boldsymbol{J} \\tag{4}
\n\\end{eqnarray}<\/p>\n

\u96fb\u8377\u306e\u4fdd\u5b58\u5247\uff08\u5fae\u5206\u5f62\uff09<\/h3>\n

\u30de\u30af\u30b9\u30a6\u30a7\u30eb\u65b9\u7a0b\u5f0f\u306e (1) \u5f0f\u306e\u4e21\u8fba\u3092\u6642\u9593 \\(t\\) \u3067\u504f\u5fae\u5206\u3059\u308b\u3068\uff08\u504f\u5fae\u5206\u3067\u3042\u308b \\(\\displaystyle \\frac{\\partial}{\\partial t}\\) \u3068 \\(\\nabla\\) \u306f\u4ea4\u63db\u53ef\u80fd\u3067\u3042\u308b\u3053\u3068\u3092\u4f7f\u3063\u3066\uff09<\/p>\n

$$\\nabla\\cdot \\frac{\\partial \\boldsymbol{D}}{\\partial t} = \\frac{\\partial \\rho}{\\partial t}$$<\/p>\n

\u307e\u305f\uff0c(4) \u5f0f\u306e\u4e21\u8fba\u306e\u767a\u6563\u3092\u3068\u308b\u3068\uff08\u56de\u8ee2\u306e\u767a\u6563\u306f\u6052\u7b49\u7684\u306b\u30bc\u30ed\uff0c\u3064\u307e\u308a \\(\\nabla\\cdot(\\nabla\\times\\boldsymbol{H}) = 0 \\) \u3067\u3042\u308b\u3053\u3068\u304b\u3089\uff09<\/p>\n

$$-\\nabla\\cdot \\frac{\\partial \\boldsymbol{D}}{\\partial t} = \\nabla\\cdot\\boldsymbol{J}$$<\/p>\n

\u3053\u308c\u30892\u3064\u306e\u5f0f\u306e\u4e21\u8fba\u3092\u8db3\u3059\u3068\u4ee5\u4e0b\u306e\u5f0f\u304c\u5f97\u3089\u308c\u308b\u3002<\/p>\n

$$\\frac{\\partial \\rho}{\\partial t} + \\nabla\\cdot\\boldsymbol{J} = 0$$<\/p>\n

\u3053\u306e\u5f62\u306e\u5f0f\u306f\u300c\u9023\u7d9a\u306e\u5f0f<\/strong><\/span>\u300d\u3068\u547c\u3070\u308c\u308b\u304c\uff0c\u4ee5\u4e0b\u306b\u8ff0\u3079\u308b\u8aac\u660e\u304b\u3089\u308f\u304b\u308b\u3088\u3046\u306b\u300c\u96fb\u8377\u306e\u4fdd\u5b58\u5247<\/strong><\/span>\u300d\u3092\u8868\u3057\u3066\u3044\u308b\u3002<\/p>\n