38. A film of water is formed between two straight parallel wires of length 10cm each separated by 0.5 cm. If their separation is increased by 1 mm while still maintaining their parallelism,
how much work will have to be done (Surface tension of water =7.2 x10-2 N/m)
(a) 7.2 x 10-6 Joule (b) 1.44 x 10-5 Joule
(c) 2.88 x 10-5 Joule (d) 5.76 x 10-5 Joule
Ans. b
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a