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BITSAT2010PhysicsMechanical Properties of FluidsActual

Two circular plates of radius 5 ~cm each, have a 0.01 mm thick water film between them. Then what will be the force required to separate these plate (S.T. of water =73 dyne/cm)?

Options

  1. A125 ~N
  2. B95 ~N
  3. C115 ~N
  4. D105 ~N

Correct answer

C. 115 ~N

Step-by-step solution

aligned F =& 2 AT d = 2 (0.05)² 73 10⁻³ 0.01 10⁻³ =& 36.5 115 newton aligned

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