The Coulomb force between charges is inversely proportional to the square of distance between them.
If the distance doubles, the force gets multiplied by (1/2)^2 = 1/4
Two charges q1 and q2 when separated by a distance r1 = R produce a force F1on each other. If the separation is increased to r2 = 2R, what is the new force F2 in terms of F1?
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