JEE Main & Advanced
Physics
Electrostatics & Capacitance
Question Bank
Charge and Coulombs Law
question_answer
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 \[2.5\times {{10}^{-5}}N\]. The dielectric constant of oil is [MP PET 2003]
A) 2.5
B) 0.25
C) 2.0
D) 4.0
Correct Answer:
D
Solution :
By using \[K=\frac{{{F}_{a}}}{{{F}_{m}}}\Rightarrow K=\frac{{{10}^{-4}}}{2.5\times {{10}^{-5}}}=4\]