Question

Electric potential on the surface of a spherical conducting shell is 50 volt. What is the potential at the centre of the shell?

Answer 1

Answer: Potential on the surface of inner there is 50 volt. Now, there can not be electric field inside the metal sphere,  hence for talking units positive charge from the surface to the sphere centre of the sphere no work is required. Therefore, at the centre also the potential is 50 volt.