Spherical balls of radius R are falling in a viscous fluid of viscosity η with a velocity v. The retarding viscous force acting on the spherical ball is:
Text Solution
Verified by ExpertsThe correct answer is:
B
Retarding force acting on a ball falling into a viscous fluid 
where 
radius of
ball, 
velocity of ball and 
coefficient of viscosity 
and 
Or in words, retarding force is directly proportional to both R and v.
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