当一个带电导体达到静电平衡时
A.导体表面上电荷密度较大处电势较高
B.导体表面曲率半径较大处电势较高
C.导体表面的电势比导体内部的电势高
D.导体表面任一点与导体内部任一点的电势差等于零
正确答案是D
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