Question

A solid conducting sphere having a charge Q is surrounded by an uncharged concentric conducting hollow spherical shell. Let the potential difference between the surface of the solid sphere and that of the outer surface of the hollow shell be V. If the shell is now given a charge of $-3$Q, the new potential difference between the same two surface is :

• A. $V$
• B. $2V$
• C. $4V$
• D. $-2V$

Answer 1

Answer: (A)

$V$

As the surfaces of conducting sphere and the hollow sphere are the equipotential surface, so potential will be constant on the surfaces. Thus the potential difference will be same as before.