the force between two point charge separated by a distance d in air is 200 N.The force of between the same two charges separated by twice the distance in a medium of dielectric constant 2 is
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F=200 N
let charge of the bodies be q1 and q2
F=kq1q2/d²
k'=2k
d'=2d
F'=k'q1q2/d'²
=2kq1q2/4d²
=kq1q2/2d²
=F/2
=100 N
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