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11. The surface tension of a liquid is 5 N/m. If a thin film of the area 0.02 m2 is formed on a loop, then its surface energy will be

(a)    5 x 102 j

(b)  2.5  x 10-2 j

(c)    2 x 10-1

(d)  5 x 10-1 j

Ans. c

(5)

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