Two point charges in air exert a force of on each other

PHYSICS · Single correct · CBSE · Physics · Electric Charges and Fields · Electric Charges and Fields

Problem

Two point charges in air exert a force of 0.36 N0.36\,\text{N} on each other. One charge is then tripled, the other is halved, the distance between them is reduced to one-third, and the entire arrangement is immersed in oil of relative permittivity εr=4\varepsilon_{r}=4. The new force between the charges is (a) 3.24 N3.24\,\text{N} (b) 0.405 N0.405\,\text{N} (c) 1.22 N1.22\,\text{N} (d) 1.62 N1.62\,\text{N}

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