Two point charges placed at a distance ′r′ in air exert a force ′F′. The distance at which they exert same force when placed in a certain medium (dielectric constant K) is
A
rK
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B
rK
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C
r√K
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D
r√K
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Solution
The correct option is Cr√K Electrostatic force in vaccum isF=14πϵ0q1q2r2....(1)Electrostatic force in dielectric medium isF′=14πϵ0Kq1q2r′2.....(2) F′=F 14πϵ0Kq1q2r′2=14πϵ0q1q2r2 r′=r√k