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 seperation of `0.5 cm`. Calculate the work required to increase `1mm` distance between the wires. Surface tension of water `=72xx10^(-3)N//m`.

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The correct Answer is:

A, D

`W=T(Delta A )`
`=T(2ld)`
`=(72xx10^(3))(2)(0.1)(10^(-3))`
`=14.4xx10^(-6)J`.

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