The workdone in increasing the size of ...

The workdone in increasing the size of a soap film from `10 cm xx 6 cm` to `10 cm xx 11 cm` is `3 xx 10^(-4)J.` The surface tension of the film is

`5xx10^-2 Nm^-1`

`3xx10^-2 Nm^-1`

`1.5xx10^-2 Nm^-1`

`1.2xx10^-2 Nm^-1`

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