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RAJASTHAN PMT Rajasthan - PMT Solved Paper-2009

  • question_answer
    Spherical ball of radius R is falling in a viscous fluid of viscosity \[\eta \]with a velocity v. The retarding viscous force acting on the spherical ball is

    A)  directly proportional to radius R but inversely proportional to velocity v

    B)  directly proportional to both radius R and to velocity v

    C)  inversely proportional to both radius R and velocity v

    D)  inversely proportional to radius R but directly proportional to velocity v

    Correct Answer: B

    Solution :

    From Stokes law, viscous force                 \[F=6\pi \eta Rv\] \[\therefore \]  \[F\propto R\]            and        \[F\propto v\]


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