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 Hence, the result