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1-A spherical conducting shell has charge +2q. There is a point charge q at the center...

1-A spherical conducting shell has charge +2q. There is a point charge q at the center of the shell. When electro static equilibrium is reached, what are the charges on the inner and outer surfaces of the shell, respectively? Answer: -q, +3q.

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so charge on inner surface is -q and charge on outer surface is +3q.

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