Electrostatics Question 16
Question: The capacity of a parallel plate condenser is $ C $ . Its capacity when the separation between the plates is halved will be [CPMT 1984]
Options:
A) $ 4C $
B) $ 2C $
C) $ \frac{C}{2} $
D) $ \frac{C}{4} $
Show Answer
Answer:
Correct Answer: B
Solution:
$ C=\frac{{\varepsilon _{0}}A}{d}.C’=\frac{{\varepsilon _{0}}A}{d/2} $
therefore $ 8r^{3}=R^{3} $
