For electrostatics, I know that conductors have 0 electric field inside. And I know that the surface of a spherical conductor has equipotential, (Maybe this is true for all shape of conductor in equilibrium right? ). So my question is, is the potential 0 inside a conductor as well? Is it only equipotential from surface to very far away from the spherical conductor? The inside and outside of the conductor are not equipotential "equal in potential" ? Thanks so much for your time.