问题描述:
大学物理小题取无穷远处为参考零电势点,半径为R的导体球带电后其电势产U,则球外离球心距离为r处的电场强度的大小为?
RU/(r^2)
最佳答案:
设导体球所带电荷量为Q,由题意:
U=kQ/R.1
又由于,在r处的电场强度:
E=kQ/r^2.2
联立1,2得:
E=RU/r^2
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