40. Two small drops of mercury, each of radius R, coalesce to form a single large drop. The ratio of the total surface energies before and after the change is
(a) 1:21/3 (b) 21/3:1
(c) 2 : 1 (d) 1 : 2
Ans. b
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a