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Q.

Electrostatic force between two charges placed in vacuum is F. If the same charges are placed at the same separation in a medium of dielectric constant K. force between them will be

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a

K2F

b

F

c

KF

d

FK

answer is C.

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Detailed Solution

In vacuum electro static force F1=14πε0q1q2r2

In mediumF2=14πεq1q2r2

Since ε=kε0

=14πKε0q1q2r2

F2=F1K

F1=14πε0q1q2r2

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