JEE Main 2021PhysicsRotational MotionMediumMCQ

JEE Main 2021 — Rotational Motion Question with Solution

JEE Main 2021 (17 Mar Shift 1)

Question

A triangular plate is shown. A force F→=4i^-3j^ is applied at point P. The torque at point P with respect to point O and Q are:

Choose an option

Show full solutionCorrect option: A
Correct answer
A-15-203,15-203

Step-by-step explanation

F→=4i^-3j^

r→1=5i^+53j^ and r→2=-5i^+53j^

Torque about 'O'

τ→O=r→1×F→=-15-203k^

Torque about 'Q'

τ→Q=r→2×F→=15-203k^

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About this question

This is a previous-year question from JEE Main 2021, 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.