Electrostatics Question 57
Question: The capacitance of a metallic sphere will be$ 1\mu F $ , if its radius is nearly [MP PMT 1992; MH CET (Med.) 2001; UPSEAT 1999]
Options:
A) 9 $ km $
B) 10$ m $
C) 1.11 $ m $
D) 1.11 $ cm $
Show Answer
Answer:
Correct Answer: A
Solution:
$ 4\pi {\varepsilon _{0}}r=1\times {{10}^{-6}} $
therefore $ r={{10}^{-6}}\times 9\times 10^{9}=9km $
