The electric field inside a conductor is zero since the voltage inside the conductor is constant (at equilibrium), and a charged conducting sphere is a good example for potential of a conductor.

Some of the important electrostatic results in conductor:

1. Inside a conductor, electrostatic field is zero.

2. At the surface of a charged conductor, electrostatic field is perpendicular to the surface at every point.

3. The interiors of a charged conductor can not have excess charge, the excess charges reside only on the surface.

4. Electrostatic potential is a constant throughout the volume of a conductor, and has the same value inside and on the surface.