A total electric charge of 4.50 nc is distributed uniformly over the surface of a metal sphere with a radius of 20.0cm . The potential is zero at a point at infinity.
Find the value of the potential at 60.0 cm from the center of the sphere.
Find the value of the potential at 20.0 cm from the center of the sphere.
Find the value of the potential at 14.0cm from the center of the sphere.