The electric potential energy stored by two charges 
and 
a distance r apart is given in cgs by
and in MKS by
where
is the permittivity of free space.
For n charges in cgs,
and in MKS,
For a continuous distribution,
where
is he voltage at point r due to all other charge.
and a distance r apart is given in cgs by(1)
and in MKS by
(2)
where
is the permittivity of free space.For n charges in cgs,
(3)
and in MKS,
(4)
For a continuous distribution,
(5)
where
is he voltage at point r due to all other charge.
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