The surface tension of a liquid is 5N per metre.If a film is held on a ring of area 0.02m2 its surface energy is -------

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0.3 J

0.4 J

0.1 J

0.2 J

answer is D.

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Detailed Solution

surface energy = area x surface tensionas it is a soap film it has two surfaces so surface energy is 2 x 0.02 x5= 0.2

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