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Q.

If work done in increasing the size of a soap film from 10 cm x 6 cm to 10 cm x 11 cm is 2 x 10-4 J, then the surface tension is

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a

2×10-2 Nm-1

b

2×10-4 Nm-1

c

2×10-6 Nm-1

d

2×10-8 Nm-1

answer is A.

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Detailed Solution

T = W∆A = 2×10-42×(50×10-4) = 2×10-2 N/m
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