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



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