Electrostatics Question 811
Question: The capacitance of a metallic sphere is $ 1\mu F $ , then it’s radius is nearly
Options:
A) 1.11 m
B) 10 m
C) 9 km
D) 1.11 cm
Show Answer
Answer:
Correct Answer: C
Solution:
[c] $ 4\pi {\varepsilon _{0}}r=C $
$ \Rightarrow r=C/4\pi {\varepsilon _{0}}=( 1\times {{10}^{-6}}\times 9\times 10^{9} ) $
$ =9\times 10^{3}m=9km $
