JEE Main 2020 — Rotational Motion Question with Solution
From: JEE Main 2020 (Online) 5th September Evening Slot
Question
A ring is hung on a nail. It can oscillate, without
slipping or sliding
(i) in its plane with a time period T1 and,
(ii) back and forth in a direction perpendicular to its plane,
with a period T2. The ratio will be :
(i) in its plane with a time period T1 and,
(ii) back and forth in a direction perpendicular to its plane,
with a period T2. The ratio will be :
Choose an option
Show full solutionCorrect option: B
Correct answer
B
Step-by-step explanation
Moment of inertia in case (i) is I1
Moment of inertia in case (ii) is I2
I1 = 2MR2
I2 = + MR2 =
T1 =
and T2 =
=
=
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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.