Electrostatics Question 74
Question: A charge of $ {{10}^{-9}}C $ is placed on each of the 64 identical drops of radius $ 2cm $ . They are then combined to form a bigger drop. Find its potential [MP PET 1997]
Options:
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 $
Show Answer
Answer:
Correct Answer: A
Solution:
$ V={{n}^{2/3}}v $
therefore $ V={{(64)}^{2/3}}\times 9\times 10^{9}\times \frac{{{10}^{-9}}}{(2\times {{10}^{-2}})} $ = 7.2 x 103 V
