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The surface tension of a liquid is 0.5 N/m. If a liquid film is formed on a ring of area 0.02 m2 then its surface energy will be
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Correct option is B
Given,
Surface tension = 0.5N/m
area of the ring = 0.02 m2
The net area is = 2 × surface area since a ring has two open surfaces and the thin film will form on both of them.
Hence the correct answer is 0.02J.
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