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Friday, 9 October

JEE Main 2025 · PhysicsNumerical answerNumerical valueEasyCalculation

JEE Main 2 April 2025, Shift 2, Physics Q46

Question 46 of 75 in this shift, Physics question 21 of 25, Section B.

A wheel of radius 0.2 m rotates freely about its center when a string that is wrapped over its rim is pulled by force of 10 N as shown in figure. The established torque produces an angular acceleration of 2 rad/s22\ \mathrm{rad/s^2}. Moment of intertia of the wheel is __________ kg m2\mathrm{kg\,m^2}. (Acceleration due to gravity =10 m/s2= 10\ \mathrm{m/s^2})

The figure, in words

A wheel (disc) mounted on a fixed axle hung from the ceiling; a string wrapped over its rim hangs down on the right side and is pulled downward by a force of 10 N.

Official answer

1

NTA final key.

Chapter
System of Particles and Rotational Motion
Topic
Torque and Equilibrium
Idea tested
Lever Arm Method

Same idea in other shifts

Asked 2× in all
  1. 24 Jun 2022, Shift 1 · Q60A metre scale is balanced on a knife edge at its centre. When two coins, each of mass 10 g are put one on the top of the other at the 10.0…MediumNumerical value

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.