問題詳情
4.一半徑爲R的球殼，有電荷均勻分布於其表面，總電荷量爲 Q。求下列點的電場：殼的
（a)外部r處的電場爲______，及
（a)外部r處的電場爲______，及
參考答案
答案：C
難度：適中0.449867
統計：A(388),B(69),C(507),D(16),E(0)
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