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 =7.2×10-2 N/m)

(a) 7.22×10-6 Joule                         (b) 1.44×10-5 Joule

(c) 2.88×10-5 Joule                          (d) 5.76×10-5 Joule

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