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  3. Chhattisgarh PMT

Chhattisgarh PMT Chhattisgarh PMT Solved Paper-2006

  • 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 JR 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 Stoke's law, viscous force \[F=6\pi \eta Rv\]                 \[\therefore \]  \[F\propto R\]  and   \[F\propto v\]


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