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Q.

Two point charges placed at a distance r in air experience a certain force. Then the distance at which they will experience the same force in a medium of dielectric constant K is

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a

r+K

b

rK

c

r/K

d

Kr

answer is C.

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Detailed Solution

q1q˙2r2=q1q2Kr2

Kr2=r2r_′=rK

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