Re: [問題] 電磁學
※ 引述《brazavi (none)》之銘言：
: ※ [本文轉錄自 Grad-ProbAsk 看板]
: 作者: brazavi (none) 看板: Grad-ProbAsk
: 標題: [問題] 電磁學
: 時間: Mon Feb 2 15:17:13 2009
: A slab of linear dielectric material of permitivity ε
: is partially inserted between the plates of a parallel-plate
: capacitor of width W, length L, and separation d.
: The capacitor is charged to a voltage Vo by a battery.
: Determine the electric force on the slab after the battery
: is disconnected.
: 從題目敘述...似乎系統應該是電荷固定
: 可是洪燁電磁學裡面卻是用電壓固定系統來算受力
: 請問到底是...？
┌────┐
────────── │
┌──────┐ ↑ \ Vo
│ ε │ ε0 d │
└──────┘ ↓ │
────────── │
←── W ───→└───┘
系統圖是這樣...
我後來查程雋的書，他是用電荷固定去算受力
→
F = -grad(We)
@@"
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