Re: [理工] [電磁]-導體的特性
※ 引述《LinKoChien (我是北七謙)》之銘言：
: 某一年台大電信所的題目
: 在李長綱講義的"導體"這一節裡
: 第三小題問：有一導體球殼 內半徑a 外半徑b
: 若將導體球接地 電荷q置於原點 則(R,0,0)處的電位為何?
: 大家會怎麼思考這個問題???
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q 1 | 2 | 3
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R=0 R=a R=b ---
- <---接地
region 1:
let k=q/4πε and take V(R→∞)=0為參考點
1 R a dR 1 1
E=k---- VR-V∞=-∫EdR=∫k---- =k(--- - ----)
R^2 ∞ R R^2 R a
region 2:
E=0 V=0 (導體等位)
region 3:
E=0 V=0 (E=0 ->V=0)
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◆ From: 123.193.214.165
※ 編輯: iyenn 來自: 123.193.214.165 (11/17 09:07)
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