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Viscosity & Stokes' Law question from NEET 2021

Q25NEET 2021Medium

Viscosity & Stokes' Law

The velocity of a small ball of mass M and density d, when dropped in a container filled with glycerin becomes constant after some time. If the density of glycerin is $\frac{d}{2}$ , then the viscous force acting on the ball will be:

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Answer: (b)

At constant velocity: $F_v = Mg - B$ .
$B = V\frac{d}{2}g = \frac{Mg}{2}$
$F_v = \frac{Mg}{2}$
So the answer is (b) $\frac{Mg}{2}$ .

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