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Question: Two charges placed in air repel each other by a force of \(10^{- 4}N\). When oil is introduced betwe...

Two charges placed in air repel each other by a force of 10−4N10^{- 4}N. When oil is introduced between the charges, the force becomes2.5×10−5N2.5 \times 10^{- 5}N. The dielectric constant of oil is

A

2.5

B

0.25

C

2.0

D

4.0

Answer

4.0

Explanation

Solution

By using K=FaFm⇒K=10−42.5×10−5=4K = \frac{F_{a}}{F_{m}} \Rightarrow K = \frac{10^{- 4}}{2.5 \times 10^{- 5}} = 4