If ' n ' identical water drops (assumed spherical each) each charged to a potential energy U coalesce to form a single drop, the potential energy of the single drop is (Assume that drops are uniformly charged):
Text Solution
Verified by ExpertsThe correct answer is:
D
Let q is charge and a is radius of single drop.
∴ U single drop = 
Now, charge on big drop = nq.
& let Radius of big drop is R.
∴ By conservation of volume
⇒ 
⇒ R = an 1/3 .
∴ P.E. of big drop = 
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