The attractive or repulsive forces which act between any two charged species is an electric force.
The electric force depends on the distance between the charged species and the amount of charge which can be calculated by the formula given as follows
F = k×[tex]\frac{q1q2}{r2}[/tex]
where, K is coulombs constant, which is equal to - 9 x10^9 [tex]Nm^2/C^2.[/tex]
The unit for K is newtons square meters per square coulombs.
