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QJEEM25Phd249: JEE Main 2025 Physics - Class 11 JEEM25Phd249 Solution: A small rigid spherical ball of mass M is dropped in a long…

A small rigid spherical ball of mass M is dropped in a long vertical tube containing glycerine. The velocity of the ball becomes constant after some time. If the density of glycerine is half of the density of the ball, then the viscous force acting on the ball will be (consider g as acceleration due to gravity)

Multiple Choice Options

  • A 2 Mg
  • B 32Mg\frac{3}{2} \mathrm{Mg}
  • C Mg2\frac{\mathrm{Mg}}{2}
  • D Mg

Step-by-Step Verified Solution

JEE Main 2025 (Online) 22nd January Evening Shift Physics - Properties of Matter Question 12 English Explanation

amp;mg−FB−f=0amp;⇒mg−mg2−f=0amp;∴f=mg2\begin{aligned}& \mathrm{mg}-\mathrm{F}_{\mathrm{B}}-\mathrm{f}=0 \\& \Rightarrow \mathrm{mg}-\frac{\mathrm{mg}}{2}-\mathrm{f}=0 \\& \therefore \mathrm{f}=\frac{\mathrm{mg}}{2}\end{aligned}

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