Electrostatics Question 111
Question: The capacity of a parallel plate condenser is $ 10\mu F $ , when the distance between its plates is 8 cm. If the distance between the plates is reduced to 4 cm, then the capacity of this parallel plate condenser will be [CBSE PMT 2001]
Options:
A) $ 5\mu F $
B) $ 10\mu F $
C) $ 20\mu F $
D) $ 40\mu F $
Show Answer
Answer:
Correct Answer: C
Solution:
$ C\propto \frac{1}{d}\Rightarrow \frac{C _{1}}{C _{2}}=\frac{d _{2}}{d _{1}} $ so $ \frac{C _{2}}{10}=\frac{8}{4}\Rightarrow C _{2}=20\mu F $
