JEE Main 2025 — Rotational Motion Question with Solution
JEE Main 2025 (28 Jan Shift 1)
Question
Two iron solid discs of negligible thickness have radii and and moment of intertia and , respectively. For , the ratio of and would be , where ________ -
Enter your answer
Show full solutionCorrect answer: 16
Correct answer
16
Step-by-step explanation
Given $\begin{aligned} & M_1=\sigma \times \pi R_1^2=M_o \\ & M_2=\sigma \times \pi R_2^2=M_o \\ & M_2=\sigma \times \pi R_2^2=\sigma \times \pi\left[2 R_1\right]^2=\sigma \times 4 \pi R_1^2=4 M_o \end{aligned}$
Practice this on the real CBT interface
Solve this JEE Main question (and the rest of the Rotational Motion chapter) on PrepSharp's TCS iON-style CBT player — with timer, bookmarks and session analytics.
Solve interactively →About this question
This is a previous-year question from JEE Main 2025, 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.