JEE Main 2021PhysicsMathematics in PhysicsEasyMCQ

JEE Main 2021 — Mathematics in Physics Question with Solution

JEE Main 2021 (27 Jul Shift 1)

Question

Assertion A: If A, B, C, D are four points on a semi-circular arc with a centre at O such that |AB→|=|BC→|=|CD→|. Then, AB→+AC→+AD→=4AO→+OB→+OC→

Reason R: Polygon law of vector addition yields AB→+BC→+CD→+AD→=2AO→

In the light of the above statements, choose the most appropriate answer from the options given below.

Choose an option

Show full solutionCorrect option: D
Correct answer
DBoth A and R are correct but R is not the correct explanation of A.

Step-by-step explanation

Polygon law is applicable in both but the equation given in the reason is not useful in explaining the assertion.

Practice this on the real CBT interface

Solve this JEE Main question (and the rest of the Mathematics in Physics 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 2021, covering the Mathematics in Physics 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.