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Question

Charges Q1 and Q2 are in vacuum initially. Q2 experiences a net force F due to the presence of Q1. They are now placed in a new medium of dielectric constant εrand the relative distance between them is maintained. The new net force experienced by Q2 due to the presence of Q1 is


A

Fεr

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B

Fεr

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C

F(1+εr)

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D

Electrostatic force does not change with medium

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Solution

The correct option is A

Fεr


Net force on Q2 in medium of relative permittivity εr

F2=14πεrε0Q1Q2r2(εr=εmediumε0)F2F=14πεrε0Q1Q2r214πε0Q1Q2r2F2=Fεr


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