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} $



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