Electrostatics Question 28
Question: The respective radii of the two spheres of a spherical condenser are $ 12\ cm $ and $ 9\ cm $ . The dielectric constant of the medium between them is 6. The capacity of the condenser will be [MP PET 1993]
Options:
A) $ 240pF $
B) $ 240\mu F $
C) $ 240F $
D) None of the above
Show Answer
Answer:
Correct Answer: A
Solution:
$ C=4\pi {\varepsilon _{0}}K[ \frac{ab}{b-a} ]=\frac{1}{9\times 10^{9}}.6[ \frac{12\times 9\times {{10}^{-4}}}{3\times {{10}^{-2}}} ] $
$ =24\times {{10}^{-11}}=240pF $
