Electrostatics Question 288

Question: A given charge is situated at a certain distance from an electric dipole in the end-on position experiences a force F. If the distance of the charge is doubled, the force acting on the charge will be [MNR 1986]

Options:

A) 2F

B) F / 2

C) F / 4

D) F / 8

Show Answer

Answer:

Correct Answer: D

Solution:

Force on charge $ F=q(E _{a})=q\times \frac{k.2p}{r^{3}} $

therefore $ F\propto \frac{1}{r^{3}} $ When r ® doubled; F ® $ \frac{1}{8} $ times



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