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Two charges placed in air repel each other by a force of 10−4 N. When oil is introduced between the charges, the force becomes 2.5×10−5 N. The dielectric constant of oil is

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a

2.5

b

0.25

c

2.0

d

4.0

answer is D.

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Detailed Solution

By using K=FaFm⇒K=10−42.5×10−5=4

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