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Q.

When air is replaced by a dielectric medium of constant K, the maximum force of attraction between two charges, separated by a distance

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a

increases K times

b

becomes 1K2times

c

remains unchanged 

d

decreases K times

answer is A.

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Detailed Solution

The force of interaction is given by 14πKϵ0q1q2r2, K is the dielectric constant.

So the force decreases K times.

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When air is replaced by a dielectric medium of constant K, the maximum force of attraction between two charges, separated by a distance