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Q.

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

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a

0.2 Nm-1

b

0.8 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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