Two particles with charges q, and q, are kept at a certain distance to exert force F on each other. If the distance is reduced to one-fifth, then the force between them is:
F = k$$\frac{q_{1}q_{2}}{r^2}$$
F is inversely proportional to r,so if the distance is reduced to one-fifth , F will increase 25 times.
So , the answer would be option d)25F.
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