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  4. A charge q is distributed uniformly on the surface of a sphere of radius R. It is covered by a concentric hollow conducting sphere of radius 2 R. Charge on the outer surface of the hollow sphere will be, if it is earthed

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Q. A charge $q$ is distributed uniformly on the surface of a sphere of radius $R$. It is covered by a concentric hollow conducting sphere of radius $2 \,R$. Charge on the outer surface of the hollow sphere will be, if it is earthed

Electrostatic Potential and Capacitance

Solution:

If outer surface is earthed its charge becomes $0$.