The work done in increasing the size of a soap film from 10 cm × 6 cm to 10 cm × 11 cm is 3 × 10-4 joule. The surface tension of the film is:

1
1.5 × 10-2 N/m
2
3.0 × 10-2 N/m
3
6.0 × 10-2 N/m
4
11.0 × 10-2 N/m

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