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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

`288ergs`

B

`72ergs`

C

`144ergs`

D

`216ergs`

Text Solution

Verified by Experts

The correct Answer is:
C

Force due to surface tension of the film on the wire.
`F=2xxTxx10cm`
Work done in increasing the distance by 1mm.
`W=Fxx(0.1)`
`=2xxTxx10xx10(0.1)=2xxTxx10xx0.1=144ergs`
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