It would help a lot if you send the symbolic notation with a description of these things.
Are you referring to Coulomb's law for Electrostatic Forces (rather than electric potential)? As far as I know, there is both a gravitational potential and an electrical potential, neither of which look like the universal law of gravitation.
Coulomb's law for electrostatic forces:
F = k[Qq/r^2]
where F is electrostatic force, k is a constant (9 x 10^9 according to text on my lap), Q and q are values of two different charges, and r is the distance between the charges.
Newton's law for gravity:
F = G[Mm/r^2]
where F is gravitational force, G is a gravitation constant, M and m re the two different masses, and r is the distance between them.
If it something else you have in mind, I don't know.
You will probably get better results if you can post explicit formulae.
There is no sense going on if this is not what you are looking for.