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這題 簡易電場 問題 該怎麼判斷大小排列? 平板電荷
Aug 17th 2013, 23:25

LI大師, sorry, 我又有不同看法, 參考一下:

我們把這電板的面積給放到很大很大, (R很大的極限狀況, 或z很小的極限狀況)
 
因為帶電無限大平板電場E= σ/2ε
 
 面電荷密度σ=Q/A , 面電荷密度σa>σc>σb

所以電場大小Ea>Ec>Eb

ps: R很小的極限情況(z很大), Ea=Eb=Ec, 所以不列入考慮

參考資料： 知識+ 之問答內容是由參與Yahoo!奇摩知識+ 之網友提供，僅供參考，Yahoo!奇摩不保證其正確性。

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