43. A liquid film is formed in a loop of
area 0.05 m2. Increase in its potential energy will be (T = 0.2 N/m)
(a) 5 x 10-2J (b) 2 x 10-2j
(c) 3 x 10-2J (d) None of these
Ans. b
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a