Q. Two identical spheres carrying charges $- 9\mu C$ and $5\mu C$ respectively are kept in contact and then separated from each other. Point out true statement from the following. In each sphere
A) $1.25 \times 10^{13}$ electrons are in deficit
B) $1.25 \times 10^{13}$ electrons are in excess
C) $2.15 \times 10^{13}$ electrons are in excesss
D) $2.15 \times 10^{13}$ electrons are in deficit
Explanation
(b) After initial contact and separation, each sphere will be having $- 2\mu C$ each
$\therefore n = \ \frac{- 2 \times 10^{- 6}}{- 1.6 \times 10^{- 19}} = 1.25 \times 10^{13}$
$i.e.\ 1.25 \times 10^{13}$ electrons in excess
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.