The force between two same or opposite
electric charge can be determined by coulomb law.
Actually two opposite electric charges
attract each other and two same electric changes repulse each other. Coulomb’s
law states, the measure of this attraction or repulsion force.
If q1 and q2 charges are
separated by a distance of d then the force between them is expressed as
From, above expression it is found that the force of attraction or repulsion between two electric charges is directly proportional to the product of their magnitude and inversely proportional to the square of the distance between them.
where, ε0 is the
permittivity of free space and equal to 8.84 × 10 − 12 F / m and εr is the relative
permittivity of the medium.
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