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NEET2018PhysicsMechanical Properties of FluidsActual

A ring of radius R is kept on water surface. Surface tension of water is T and mass is m . What force required to lift the ring from water surface?

Options

  1. Am g+ T R
  2. Bm g+ R
  3. Cm g+2 T R
  4. Dm g+4 T R

Correct answer

D. m g+4 T R

Step-by-step solution

Tequired force to lift the ring F_ ext =m g+2 T(2 R) ;=m g+4 T R

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