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Question

A and B are two conducting concentric spherical shells. A is given a charge Q while B is uncharged. If now B is earthed as shown in figure. Then:

  1. The charge appearing on inner surface of B is -Q.
  2. The field inside and outside A is zero.
  3. The field between A and B is not zero.
  4. The charge appearing on outer surface of B is zero.


Solution

The correct options are
A The charge appearing on inner surface of B is -Q.
C The field between A and B is not zero.
D The charge appearing on outer surface of B is zero.

Initial condition:
Charger on outer surface of A = Q
Charger on inner surface of B = -Q
Charger on outer surface of B = Q

After earthing:
Charger on outer surface of A = Q
Charger on inner surface of B = -Q
Charger on outer surface of B = 0 [Since VB=K(Q)R+K(Q)R=0]

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