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
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a