JEE Main 2020 — Rotational Motion Question with Solution
From: JEE Main 2020 (Online) 4th September Morning Slot
Question
ABC is a plane lamina of the shape of an equilateral triangle. D, E are mid points of AB, AC and G is
the centroid of the lamina. Moment of inertia of the lamina about an axis passing through G and
perpendicular to the plane ABC is I0
. If part ADE is removed, the moment of inertia of the remaining
part about the same axis is where N is an integer. Value of N is ______.


This question includes a diagram. The text above accompanies the figure.
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Show full solutionCorrect answer: 11
Correct answer
11
Step-by-step explanation
Let
=
and
3I + I' = I0
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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.