Q. The capacitance of a metallic sphere will be $1\mu F$, if its radius is nearly
A) $9km$
B) $10m$
C) $1.11\ m$
D) $1.11\ cm$
Explanation
(a) $4\pi\varepsilon_{0}r = 1 \times 10^{- 6} \Rightarrow r = 10^{- 6} \times 9 \times 10^{9} = 9\ km$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.