题目内容
（请给出正确答案）
如图带电量为q、半径为R1的导体球A外有一内、外半径分别为R2和R3的同心导体球壳B，求：
(1)说明球壳B内表面带电量为-q的依据；(2)导体球壳B外表面的带电量为多少
(3)求A与B之间的电场强度大小的分布与电势差；
(4)计算A与B形成的球形电容器的电容。
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