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Q.

There are 27 drops of a conducting fluid. Each has a radius r and they are charged to a potential V0. These are combined to form a bigger drop. Its potential will be:

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a

V0

b

29V0

c

3V0

d

9 V0

answer is C.

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Detailed Solution

If q be the charge on each drop, charge on big drop is Q=27q.
If R be the radius of bigger drop,  ⇒R=3r

V1=kqrV2=kQR=k27q3r=9kqr=9V1

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