In a system of conductors of arbitrary size, shape and
charge configuration, each conductor is characterised by a constant
value of potential, but this constant may differ from one conductor to
the other 5 Electric field at the surface of a charged conductor
0
E=εσˆ
n
(2 35)
where s is the surface charge density and ˆn  is a unit vector normal
to the surface in the outward direction