[電磁] 求長直導體外的電位?
半徑a之長直導體,給線電荷密度ρ,求導體內外之電位?
我知道導體內部不會有電場
導體外部電場可由高斯柱對稱求得
但是電位差我不會求.....
電位差的零位面在哪?
導體內部電位=0嗎?
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