A film of water is formed between two straight parallel wires of length 10 cm 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 x 10-2 N/m)

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A film of water is formed between two straight parallel wires of length 10 cm 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 x $10^{- 2}$ N/m)

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$7.22 \times 10^{- 6} Joule$

$1.44 \times 10^{- 5} Joule$

$2.88 \times 10^{- 5} Joule$

$5.76 \times 10^{- 5} Joule$

answer is B.

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