Electrostatics Question 71
Question: The capacity of a condenser in which a dielectric of dielectric constant 5 has been used, is $ C $ . If the dielectric is replaced by another with dielectric constant 20, the capacity will become [MP PMT 1996]
Options:
A) $ \frac{C}{4} $
B) $ 4C $
C) $ \frac{C}{2} $
D) $ 2C $
Show Answer
Answer:
Correct Answer: B
Solution:
$ C=\frac{K{\varepsilon _{0}}A}{d}; $ $ \frac{C _{1}}{C _{2}}=\frac{K _{1}}{K _{2}} $
therefore $ \frac{C}{C _{2}}=\frac{5}{20} $
therefore C2 = 4C
