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MHT CET202615 April 2026Evening ShiftPhysicsMechanical Properties of FluidsActual

A square frame of each side L is dipped in a soap solution and taken out, the force acting on the film formed is ( T = surface tension of soap solution)

Options

  1. A4 ,TL
  2. B8 ,TL
  3. C12 ,TL
  4. D16 ,TL

Correct answer

B. 8 ,TL

Step-by-step solution

The perimeter of the square frame is 4L . A soap film has two free surfaces, so the effective length of the boundary in contact with the film is 2 4L = 8L . The total force due to surface tension is given by F = T effective length . F = T 8L = 8TL . Answer: 8 ,TL

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