Question

A sphere of radius R has positive charge Q uniformly distributed on its surface

Which of the following represents the magnitude of the electric field E and the potential V as functions of r, the distance from the center of the sphere, when r < R?

	E	V
(A)	0	kQ/R
(B)	0	kQ/r
(C)	0	0
(D)	kQ/r2	0
(E)	kQ/R2	0

Answer 1

The correct option is: (A)

Explanation:

Once inside a uniform sphere of charge, the electric field is zero. Since E = 0 the potential does not change within the sphere (meaning it is the same value as the surface)