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Question

The surface tension of a liquid is 5N/m. If a film is held on a ring of area 0.02m2. its surface energy is about

A
5×102J
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B
2.5×102J
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C
2×101J
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D
3×101J
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Solution

The correct option is D 2×101J
Since there are two surfaces of equal area formed on a ring,
the total surface energy of the film is given by E=2TA
putting values:

E=2×5×0.02J

E=0.2J=2×101J

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