Electrostatics Question 775

Question: The 1000 small droplets of water each of radius r and charge Q, make a big drop of spherical shape. The potential of big drop is how many times the potential of one small droplet?

Options:

A) 1

B) 10

C) 100

D) 1000

Show Answer

Answer:

Correct Answer: C

Solution:

[c] Volume of big drop=1000 × volume of each small drop 43πR3=1000×43πr3

R=10r

V=kqr and V=kqR×1000 Total charge on one small droplet is q and on the big drop is 1000q.

VV=1000rR=100010=100

V=100V



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