4 Electrostatic potential is constant throughout the volume
of the conductor and has the same value (as inside) on
its surface
This follows from results 1 and 2 above Since E = 0 inside the conductor
and has no tangential component on the surface, no work is done in
moving a small test charge within the conductor and on its surface That
is, there is no potential difference between any two points inside or on
the surface of the conductor