question_answer

An insulated charged sphere of radius 5 cm has a potential of 10 V at the surface. The potential at the centre will be:

A) same as that at 5 cm from the surface

B) same as that at 25 cm from the surface

C) 10 V

D)  zero

Correct Answer: C

Solution :

                Key Idea: Electric field inside a spherical charge is everywhere zero. Electric field inside a spherical charge is every where zero that is Therefore, if we take any other charge from one point to another inside a charged spherical shell no work will be done. This means that inside a spherical charge the potential at all points is the same as that on surface that is 10 V.