Question
The work done in increasing the size of a soap film from 10cm x 6cm to 10cm x 11cm is 3 x 10⁻⁴ J. The surface tension of the film is
Options :
1.5 x 10⁻² Nm⁻¹
3.0 x 10⁻² Nm⁻¹
6.0 x 10⁻² Nm⁻¹
11.0 x 10⁻² Nm⁻¹
Answer :
3.0 x 10⁻² Nm⁻¹
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