Coulomb discovered that the electrical force equation was very similar to the force equation issac newton had discovered.
Electrostatic force =
(a constant number) x (charge#1) x (charge#2) / (distance between them)² = 0
There you have an equation, with some stuff on the left side that's all equal to zero. The stuff is all in the form of one fraction. In order for the fraction to be zero, either the numerator is zero, or else the denominator is infinite.
The force is zero if ...
-- at least one of the charges is zero, OR
-- the charges are an infinite distance apart.
If you can arrange for either of those conditions, then you'll have zero force. charges don't attract while opposite charges do electrostatic forces between point A( which is charged) and point B (which is also charged) are proportional to the charge of point A and point B.
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