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fundamental equation of electrostatics is Coulomb's law, which describes the force between two point charges.

The magnitude of the electrostatic force between two point electric charges Q1 and Q2 is directly proportional to the product of the magnitudes of each charge and inversely proportional to the surface area of a sphere whose radius is equal to the distance between the charges:

F= Q1 Q 2 / (4*pi*r^2) ?0

where ?0 is a constant called the permittivity of free space, a defined value:

? in A2s4 kg-1m?3 or C2N?1m?2 or F m?1.

i have created two points charges and specified the magnitudes of Q 1 & Q 2.
and ?0

any help/suggestion would be highly appeciated.

thanks in advance,
Ricky