35. If work done in increasing the size of a soap film from to is then the surface tension is
(a) 2 x 10-2Nm-1 (b) 2 x 10-4Nm-1
(c) 2 x 10-6Nm-1 (d) 2 x 10-8Nm-1
Ans. a
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a