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NEET2024PhysicsMechanical Properties of FluidsActual

A thin flat circular disc of radius 4.5 cm is placed gently over the surface of water. If surface tension of water is 0.07 ~N ~m ⁻¹ , then the excess force required to take it away from the surface is

Options

  1. A198 N
  2. B1.98 mN
  3. C99 N
  4. D19.8 mN

Correct answer

D. 19.8 mN

Step-by-step solution

aligned & Excess force =T 2 R & = 7 100 2 3.14 4.5 100 & =197.82 10⁻⁴ & =19.8 10⁻³ ~N & =19.8 mN aligned

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