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Q.

A film of water is formed between two straight parallel wires each 10cm long and at separation 0.5cm. Calculate the work required to increase 1mm distance between the wires, if the surface tension of water is 72 x 10-3 Nm-1

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a

72×10−7J

b

80×10−7J

c

36×10−7J

d

144×10−7J

answer is A.

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Detailed Solution

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Ai=2(l×b)=2(10×0.5)cm2=10−3m2
Af=[10×(0.5+0.1)]cm2=1.2×10−3m2
Required work
W=T×△A=72×10−3(Af−Ai)
=72×10−3(0.2×10−3)=144×10−7J

 

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