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Question

A water film is made between two straight parallel wires of length 10cm each, and at a distance of 0.5cm from each other. If the distance between the wires is increased by 1mm, how much work will be done? Surface tension of water=7.2×102 N/m.

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Solution

W=T(ΔA)
=(7.2×102)[2(0.1)(103)]
=1.44×105 J

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