Objective question in Electrostatics

A sphere of 4 cm radius is suspended within a hollow sphere of 6 cm radius. The inner sphere is charged to a potential 3 e.s.u. When the outer sphere is earthed. The charge on the inner sphere is a) 54 e.s.u. b) frac{1}{4},e.s.u. c) 30 e.s.u. d) 36 e.s.u.

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