Q. A charge of $10^{- 9}C$ is placed on each of the 64 identical drops of radius $2\ cm.$ They are then combined to form a bigger drop. Find its potential
A) $7.2 \times 10^{3}V$
B) $7.2 \times 10^{2}V$
C) $1.44 \times 10^{2}V$
D) $1.44 \times 10^{3}V$
Explanation
(a) $V = n^{2/3}v \Rightarrow V = (64)^{2/3} \times 9 \times 10^{9} \times \frac{10^{- 9}}{(2 \times 10^{- 2})}$
$= 7.2 \times 10^{3}\ V$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.