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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

(5)

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