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MHT CET 2025 (25 Apr, Shift 1) · Viscosity & Stokes' Law

Viscosity & Stokes' Law question from MHT CET 2025 (25 Apr, Shift 1)

Q6MHT CET 2025 · 25 APR · SHIFT 1Medium

Viscosity & Stokes' Law

The velocity of small spherical ball of mass ' $m$ ' and density ' $\mathrm{d}_1$ ', when dropped in a container filled with glycerine becomes constant after some time. The viscous force acting on the ball if density of glycerine is ' $\mathrm{d}_2$ ' is

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Answer: (a)

At constant velocity: $F_v = mg - B$ .
$B = V d_2 g = \frac{m}{d_1}d_2 g$
$F_v = mg\left(1 - \frac{d_2}{d_1}\right)$
So the answer is (a) $mg\left(1 - \frac{d_2}{d_1}\right)$ .

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