Question

A and B are two concentric hollow spheres. If A is given a charge Q while B is earthed as shown in figure.

• A. The charge density of A and B are same
• B. The field inside and outside A is zero
• C. The field between A and B is not zero
• D. The field inside and outside B is zero

Answer 1

The correct option is C The field between A and B is not zero


If outer surface of B is earthed with positive charge placed on A, then inner face of B is induced with $(–Q)$ charge. Hence, electric field between A and B is not zero.