※ 引述《Dusuren ()》之銘言:
: 各位大大好
: 請教關於推導電通密度時的問題
: 對電場取散度在乘上介電常數會等於總電荷密度
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Im not sure if this is right...(maybe you are right im wrong)
but this is what i think
Gauss law:
delt‧E=4 pi rho
=4 pi(rhob+rhof) where rhob=electron bound on media
rhof=electron free to move
Gauss law for E-field inside dielectric material
delt‧D=4 pi rhof
and also D=cE (c is the dielectric constant, i cant type epsilon so i use c)
therefore,
delt‧D=delt‧cE=c(delt‧E)=c4 pi rho
so, at this point, I think if you only take the divergence of E, this is
where you get the total electron density but not after you multiply the
dielectric constant
: 也就是應該是原本的電荷密度加上極化的體電荷密度以及極化的面電荷密度
: 可是我看推導時 都沒加上極化的面電荷密度 請問一下這是為什麼 謝謝
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※ 編輯: lewisweilin 來自: 99.245.10.248 (03/30 10:50)