Question

In the given figure radius of the conducting sphere is increasing according to the relation R = Vt. A point charge q is fixed at distance ‘a’ from centre of conducting sphere. The current flowing in the earthen conductor at the instant when R < a is :-

• A.
• B.
• C. Due to the reason that potential of sphere is zero
• D. Due to the reason that field inside sphere is changing with time

Answer 1

Answer: (A), (C)

The correct options are
A
C Due to the reason that potential of sphere is zero

Potential on sphere
$\frac{K{q}^{\prime }}{R}+\frac{KQ}{a}=0\Rightarrow q^{\prime }=-\frac{qR}{a}I=\frac{dq}{dt}=-\frac{qV}{a}=\frac{qV}{a}awayfromsphere$