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in Physics by (25.0k points)
A sphere of `4 cm` radius is suspended within a hollow sphere of `6 cm` radius. The inner sphere is charged to potential `3` e.s.u. and the outer sphere is earthed. The charge on the inner sphere is
A. `1/4` esu
B. `30` esu
C. `36` esu
D. `54` esu

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