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JEE PHYSICS MCQ: MECHANICAL PROPERTIES OF FLUIDS

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Spherical ball of radius

R

are falling in a viscous fluid of viscosity ɳ with a velocity

v

. The retarding viscous force acting on the spherical ball is

View answer and explanation

Correct option: B

directly proportional to both radius

R

and velocity

v

Option B (directly proportional to both radius R and velocity v) is correct because the viscous force is given by Stokes' law: F = 6πηRv.

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