Asseration: A point charge `q` is placed at centre of spherical cavity inside a spherical conductor as shown. Another point charge `Q` is placed outside the conductor as shown. Now as the point charge `Q` is pushed away from conductor, the potential difference `(V_(A) - V_(B))` between two points `A` and `B` within the cavity of sphere remains constant.

Reason: The electric field due to charges on outer surface of conductor and outside the conductor is zero at all points inside teh conductor.

Options

A. If both assertion and reason are true and reson is the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If the assertion is true but the reason are false.
D. If both the assertion and reason are false.

Answer

A

Explanation

The electric field inside the cavity depends only on point charge `q`. Hence `V_(A) - V_(B)` remains constant even if point charge `Q` is shifted. Here reason is correct explanation of assertion.