Question

A and B are two concentric spherical shells, If A is given a charge +q while B is earthed as show in the 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

Answer: (D)

All of the above.

When a body is connected to the ground, then charge flow from body to ground or vice versa till the potential of body becomes zero. Therefore equal and opposite charge will appear on the inner surface of the outer sphere B.
Inside the sphere A, field is zero because there is no charge inside spherical cell A.
Field is zero outside the sphere B because it has zero enclosed charge.
Ans: $\left(D\right)$