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

Question

A rectangular film of liquid is extended from ( 4 cm × 2 cm ) to ( 5 cm × 4 cm ) . If the work done is 3 × 10 - 4 J , the value of the surface tension of the liquid is, 0.250 N m - 1, 0.125 N m - 1, 0.2 N m - 1, 8.0 N m - 1

MARKS App · Accepted Answer

W = 2 A f - A i T ⇒ T = W A f - A i × 2 = 3 × 10 - 4 J 2 5 × 4 × 10 - 4 - 4 × 2 × 10 - 4 = 0.125 N m - 1

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