Two parallel wires each of length 10 cm are 0.5 cm apart. A film of water is formed between them….

Q: Two parallel wires each of length 10 cm are 0.5 cm apart. A film of water is formed between them. If surface tension of water is 0.072 N/m, then the work done in increasing the distance between the wires by 1 mm is

(a) 1.44 × 10-5 J

(b) 1.72 × 10-5 J

(c) 1.44 × 10-4 J

(d) 1.72 × 10-4 J

Ans: (a)

Author: Rajesh Jha

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