Question

Point charge Q is placed at distance r from the centre of conducting sphere of radius R (r>R) which of the following is correct

1. The potential at centre is zero

2. The potential at centre is kq/r

3. The charge Sphere is zero

4. Both 2 and 3

Answer 1

2). Potential at centre = kq/r


In static condition there is no electric field and no net charge at any point inside a conductor. The charge must appear at the surface of the conductor. Potential (V) at the centre or any point inside it is same and its value is that at its surface (a conductor is an equipotential volume).

Hence,potential at centre

V=kq/r