Question

A conductor A is given a charge of amount +Q and then placed inside a deep metal can B, without touching it. Then:

• A. The potential of A does not change when it is place inside B.
• B. If B is earthed, +Q amount charge flows from it into the earth.
• C. If B is earthed, the potential of A is reduced.
• D. Either (B) or (C) is true or both the true only if the outer surface of B is connected to earth and not its inner surface.

Answer 1

Answer: (A), (B), (C)

The correct options are
A If B is earthed, +Q amount charge flows from it into the earth.
B The potential of A does not change when it is place inside B.
C If B is earthed, the potential of A is reduced.

When A is placed inside the B, net charge will same and potential will not change.
For earthing the charge will flow from higher potential to lower potential.
When B is earthed, the charge Q flow from it into the earth and the potential of A will also reduce.
Ans: $\left(A\right),\left(B\right),\left(C\right)$