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A film of water is formed between two st...

A film of water is formed between two straight parallel wires each `10 cm` long and at a separatin `0.5 cm`. Calculate the work required to increase `1 mm` distance between wires. Surface tension `= 72 xx 10^(-3) N//m`.

Text Solution

Verified by Experts

The correct Answer is:
`14.4 xx 10^(-6) J`
The process is shown in the figure. As we have to produce `2` film, so
`DeltaW = (2 DeltaA) T`
`= 2 [10 cm xx 0.6 cm - 10 cm xx 0.5 cm] xx 72 xx 10^(-3)(N)/(m)`
`= 2 xx (10 xx 10^(-2)m)(0.1 xx 10^(-2)m) xx 72 xx 10^(-3)(N)/(m)`
`= 1.44 xx 10^(-6) J`
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