Electrostatics Question 161
Question: The ratio of the forces between two small spheres with constant charge $ (a) $ in air $ (b) $ in a medium of dielectric constant K is [MNR 1998]
Options:
A) 1 : K
B) K : 1
C) $ 1:K^{2} $
D) $ K^{2}:1 $
Show Answer
Answer:
Correct Answer: B
Solution:
$ F _{a}=\frac{q _{1}q _{2}}{4\pi {\varepsilon _{0}}r^{2}},F _{b}=\frac{q _{1}q _{2}}{K4\pi {\varepsilon _{0}}r^{2}} $
therefore $ F _{a}:F _{b}=K:1 $
