Electrostatics Question 102
Question: The capacity of a parallel plate condenser is $ 15\mu F $ , when the distance between its plates is 6 cm. If the distance between the plates is reduced to 2 cm, then the capacity of this parallel plate condenser will be [AFMC 2000]
Options:
A) $ 15\mu F $
B) $ 30\mu F $
C) $ 45\mu F $
D) $ 60\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}} $
therefore $ \frac{15}{C _{2}}=\frac{2}{6} $
therefore C2 = 45mF
