A rectangular film of liquid is extended...

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

`0.2 Nm^-1`

`8.0 Nm^-1`

`0.250 Nm^-1`

`0.125 Nm^-1`

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