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23. The amount of work done in forming a soap film of

size 10 cm x 10 cm is (Surface tension T= 3 x 10-2 Nm

(a)6 x 10-4 j                                    

(b) 3 x 10-4 j

(c) 6 x 10-3 j                             

d) 3 x 10-4 j

Ans. a

(10)

5/5 - (3 votes)

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