44. In order to float a ring of area 0.04 m2 in a liquid of surface tension 75 N/m, the required surface energy will be
(a) 3 J (b) 6.5 J
(c) 1.5 J (d) 4 J
Ans. a
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a