A) directly proportional to R but inversely proportional to \[v\]
B) directly proportional to both radius R and velocity \[v\]
C) inversely proportional to R but directly proportional to velocity \[v\]
D) inversely proportional to R but directly proportional to velocity \[v\]
Correct Answer: B
Solution :
Retarding force acting on a ball falling into a viscous fluid \[F=6\pi \eta Rv\] where R = radius of ball, v = velocity of ball and \[\eta =\] coefficient of viscosity \[\therefore \] \[F\propto R\] and \[F\propto v\] Or in words, retarding force is directly proportional to both R and v.You need to login to perform this action.
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