Eight equal charged tiny drops are combined to form a big drop. If the potential on each drop is 10V. Then potential of big drop will be :

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40 V

10 V

30 V

20 V

answer is A.

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Detailed Solution

Volume = constant ⇒8 x 43πr3=43πR3⇒r=R2Vbig=k(8q)R=8kq2r=4kqr=4Vtiny =4 x 10 V=40 V

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