JEE Main 2002 — Rotational Motion Question with Solution
From: AIEEE 2002
Question
Initial angular velocity of a circular disc of mass is Then two small spheres of mass are attached gently to diametrically opposite points on the edge of the disc. What is the final angular velocity of the disc?
Choose an option
Show full solutionCorrect option: C
Correct answer
C
Step-by-step explanation
When two small spheres of mass are attached gently, the external torque, about the axis of rotation, is zero.
So, = 0
= conserved
So the angular momentum about the axis of rotation is conserved.
So, = 0
= conserved
So the angular momentum about the axis of rotation is conserved.
Here Moment of inertia of Disc and
After adding two sphere Moment of Inertia of disc and two sphere,
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This is a previous-year question from JEE Main 2002, 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.