Two point charges placed at a certain distance r in air exert a force F on each other. Then, the distance r' at which these charges will exert the same force in a medium of dielectric constant k is given by
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a
r
b
r/k
c
r/k
d
rK
answer is C.
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Detailed Solution
In air : F=14πε0q1q2r2In Medium : F=14πεkr'2⇒Kr'2=r2⇒r′=rK
Two point charges placed at a certain distance r in air exert a force F on each other. Then, the distance r' at which these charges will exert the same force in a medium of dielectric constant k is given by