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.



(1)
and in MKS by

(2)
where

For n charges in cgs,

(3)
and in MKS,

(4)
For a continuous distribution,

(5)
where

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