6
Question
A film of water is formed between two straight parallel wires each of 10cm long and at separation of 0.5cm. The work to be done to increase the distance between the wires by 1mm is ...................... mJ (given surface tension of water is 72×10−3Nm−1).
A film of water is formed between two straight parallel wires each of 10cm long and at separation of 0.5cm. The work to be done to increase the distance between the wires by 1mm is ...................... mJ (given surface tension of water is 72×10−3Nm−1).
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Solution
The correct option is B 14.4
Work done =2(△A.)T
ΔA= change in surface area
=10×10−2×1×10−3
=10−4
∴ work done W=2×10−4×72×10−3
=144×10−7
=14.4×10−3mJ
Work done =2(△A.)T
ΔA= change in surface area
=10×10−2×1×10−3
=10−4
∴ work done W=2×10−4×72×10−3
=144×10−7
=14.4×10−3mJ
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