The surface tension of liquid is 4N//m. ...

The surface tension of liquid is `4N//m`. If a thin film of area `0.02 m^2` is formed on a loop, then its surface energy will be

`2.5 xx 10^-2 J`

`1.5 xx 10^-2 J`

`1.6 xx 10^-1 J`

`2 xx 10^-1 J`

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