JEE Main 2018PhysicsRotational MotionEasyMCQ

JEE Main 2018 — Rotational Motion Question with Solution

JEE Main 2018 (15 Apr)

Question

A uniform rod AB is suspended from a point X, at a variable distance x from A, as shown. To make the rod horizontal, a mass m is suspended from its end A. A set of (m, x) value is recorded. The appropriate variables that give a straight line, when plotted, are:

Choose an option

Show full solutionCorrect option: C
Correct answer
Cm,1x

Step-by-step explanation



Net torque about suspension is zero, 
⇒mgx=Mgl2-x⇒mx=Ml2-Mx
⇒m=Ml21x-M⇒y= α1x-C, where,

y=m, a=Ml2 and C=M
it is the equation of straight line with variable m and 1x.

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About this question

This is a previous-year question from JEE Main 2018, 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.