Q.

Eight small drops, each of radius r and having same charge q are combined to form a big drop. The ratio between the potentials of the bigger drop and the smaller drop is

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a

8 : 1

b

4 : 1

c

2 : 1

d

1 : 8

answer is B.

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Detailed Solution

By using Vbig=n2/3vsmall⇒VBigvsmall=(8)2/3=41
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Eight small drops, each of radius r and having same charge q are combined to form a big drop. The ratio between the potentials of the bigger drop and the smaller drop is