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2 point charges at distance ' r ' in air exert a force ' F ' on each other, at what distance will these charges experience the same force ' F' in a medium of dielectric constant K?

Since the force in both the cases is same.So

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F = q1q2/4(pie)*E* r^2

 

F=q1q2/ (4(pie)E *K * R^2)                                        

Hence R=r/ ( K^ 1/2)

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