(ZHCS5-11 同心球电势)如图所示,两个同心的均匀带电球面,内球面半径为 R 1 、带电荷 Q 1 ,外球面半径为 R 2 、带有电荷 Q 2 .设无穷远处为电势零点,则在内球面之内、距离球心为 r 处的 P 点的电势 U 为: ( )
A.
(1)
B.
(2)
C.
(3)
D.
(4)
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