33. The surface energy of liquid film on
a ring of area is (Surface tension of liquid = 5Nm-1)
(a) 0.75 J (b) 1.5 J
(c) 2.25 J (d) 3.0 J
Ans. b
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a