Two point charges placed at a distance r in air exert a force F on each other. The value of distance R at which they experience force 4F when placed in a medium of dielectric constant K=9 is :
r
r6
r8
2r
A
2r
B
r
C
r6
D
r8
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Solution
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Initially force, F=14πϵ0q1q2r2.......(1)
Finally, 4F=14πϵq1q2R2 where K=ϵϵ0⇒ϵ=9ϵ0
now,4F=14π(9ϵ0)q1q2R2......(2)
(1)/(2),14=9R2r2⇒R=r6
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