Q. The radius of a metallic sphere if its capacitance is $1/9F,$ is
A) $10^{6}\ m$
B) $10^{7}\ m$
C) $10^{9}\ m$
D) $10^{8}\ m$
Explanation
(c) $C = 4\pi\varepsilon_{0}R,\ R = \frac{C}{4\pi\varepsilon_{0}} \Rightarrow R = (1/9) \times 9 \times 10^{9} = 10^{9}m$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.