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A rectangular film of liquid is extended...

A rectangular film of liquid is extended from `(4cmxx2cm)` to `(5cmxx4cm)`. If the work done is `3xx10^-4J`, the value of the surface tension of the liquid is

A

`0.2 Nm^-1`

B

`8.0 Nm^-1`

C

`0.250 Nm^-1`

D

`0.125 Nm^-1`

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