JEE Main 2020 — Rotational Motion Question with Solution
From: JEE Main 2020 (Online) 3rd September Morning Slot
Question
Moment of inertia of a cylinder of mass M,
length L and radius R about an axis passing
through its centre and perpendicular to the
axis of the cylinder is
I = . If such a cylinder is to be made for a given mass of a material, the ratio for it to have minimum possible I is
I = . If such a cylinder is to be made for a given mass of a material, the ratio for it to have minimum possible I is
Choose an option
Show full solutionCorrect option: B
Correct answer
B
Step-by-step explanation
Given I =
M = .V = R2L
R2 =
I =
=
For minimum I,
= 0
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This is a previous-year question from JEE Main 2020, covering the Rotational Motion chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.