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Q.

A rectangular film of liquid is extended from (4 cm x 2 cm) to (5 cm x 4 cm). If the work done is 3×10-4 J, the value of the surface tension of the liquid is

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a

0.2 Nm-1

b

8.0 Nm-1

c

0.250 Nm-1

d

0.125 Nm-1

answer is D.

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Detailed Solution

W = T(2∆A)⇒T = W2∆A = 3×10-42×12×10-4 = 0.125 Nm-1

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