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NEET2016PhysicsMechanical Properties of FluidsActual

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

Options

  1. A0.250 N m - 1
  2. B0.125 N m - 1
  3. C0.2 N m - 1
  4. D8.0 N m - 1

Correct answer

B. 0.125 N m - 1

Step-by-step solution

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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