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

A film of water is formed between two straight parallel wires of length 10 cm each separated by `0.5cm` If their separation is increased by `1mm` while still maintaining their parallelism, how much work will have to be done (Surface tension of water `=7.2xx10^-2(N)/(m)`)

A

`7.22xx10^(-6)J`

B

`1.44xx10^(-5)J`

C

`2.88xx10^(-5)J`

D

`5.76xx10^(-5)J`

Text Solution

Verified by Experts

The correct Answer is:
B
`W=2TxxDeltaA rArr 2T[l(b_(2)-b_(1))]`
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