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
