Q 2746112973.     A rectangular film of liquid is extended from `(4cm\times 2cm)` to `(5cm\times 4cm)`. If the work done is `3\times 10^{-4}`, the value of the surface tension of the liquid is

NEET 2016
A

`8.0 N m^{-1}`

B

`0.250 N m^{-1}`

C

`0.125 N m^{-1}`

D

`0.2 N m^{-1}`

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