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如图所示,半径为R的均匀带电球面,总电荷为Q,设无穷远处的电势为零,则球内距离球心为r的P点处的电场强度的大小和电势为
A. E=0,
B. E=0,
C. 
,
D. ,
学科：大学物理A（上）2023-2024（2）
时间：2024-05-07 13:59:38
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