Asked by Anonymous

how much excess charge must be placed in a copper sphere so that its electric potential relative to infinity is 150kv
radius 0.125 m
b)what is the potential of the surface relative to infinity
Answered by bobpursley
Use Gauss law> all the charge can be placed at the center of the sphere, then..

V=kQ/r where r is the distance from the center to the sphere surface.