Question: A small ball carrying a charge (-2 q) is placed at the center of a spherical metal shell that carries a charge (+q). What are

A small ball carrying a charge $-2 q$ is placed at the center of a spherical metal shell that carries a charge $+q$. What are the sign and magnitude of the charge

$(a)$ on the inner surface of the shell and

$(b)$ on the outer surface of the shell?

(c) Do your answers change if the ball is not at the center of the shell? If so, how?

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