Question

Two concentric shells A and B have radii R and 2R, charges q_A and q_B and potentials 2V and 3V/2 respectively. Now, the shell B is earthed and the new charges on them become q'_A and q'_B. Then

(c) Potential difference between A and B after earthling becomes 3V/2

(d) Potential difference between A and B after earthling becomes V/2

Answer 1

Correct option: (a,d)

Explanation: 

When B is earthed, potential of B becomes zero. So,q'_B = - q_A {charge on A remains same)