Question

A small conducting sphere carrying charge $Q$ is surrounded by a spherical uncharged conducting shell. A small charge $+q$ is placed between the sphere and the shell, then the net charge on the

inner surface of the shell is :

• A. $-Q$
• B. $-(Q+q)$
• C. $-Q+q$
• D. none of the above

Answer 1

Answer: (B)

$-(Q+q)$

For conducting sphere all charges are distributed over the surface. So charge Q will appear on outer surface of the conducting sphere. As the charge inside shell is zero when q is placed between the conducting sphere and shell , $-(Q+q)$ will appear on the inner surface of the shell.