A hollow spherical conductor of radius 3.00 cm has 6.00 nC of charge distributed uniformly over its surface. (a)What is the electric potential at the center of the sphere(in volts)? (b) If the conductor is solid rather than hollow, what is the potential at the center of the sphere? I know V(r)=kQ/r where k= 1/4[tex]\pi[/tex][tex]E[/tex][tex]\circ[/tex] I also know that conductors have charges only present on the surface. How does a solid conductor differ from a hollow one, if they do? If they don't have potential differences, why is this?