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JEE Main & Advanced Physics Fluid Mechanics, Surface Tension & Viscosity / द्रव यांत्रिकी, भूतल तनाव और चिपचिपापन Question Bank Fluid Flow

  • question_answer
    Spherical balls of radius 'r' are falling in a viscous fluid of viscosity 'h' with a velocity 'v'. The retarding viscous force acting on the spherical ball is                                     [AIEEE 2004]

    A)            Inversely proportional to 'r' but directly proportional to velocity 'v'

    B)            Directly proportional to both radius 'r' and velocity 'v'

    C)            Inversely proportional to both radius 'r' and velocity 'v'

    D)            Directly proportional to 'r' but inversely proportional to 'v'

    Correct Answer: B

    Solution :

               \[F=6\,\pi \eta \,rv\]


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