Question

$A$ and $B$ are two concentric spherical shells. If $A$ is given a charge $+q$ while $B$ is earthed as shown in figure, then

• A. charge on the outer surface of shell $B$ is zero
• B. the charge on $B$ is equal and opposite to that of $A$
• C. the field inside $A$ and outside $B$ is zero
• D. all of the above

Answer 1

The correct option is D all of the above

As $V_B=0$, total charge inside $B$ must be zero.

Hence, charge on its outer surface is zero and on its inner surface is $-q$.