JEE Main 2020PhysicsMathematics in PhysicsMediumNumerical

JEE Main 2020 — Mathematics in Physics Question with Solution

JEE Main 2020 (07 Jan Shift 2)

Question

The sum of two forces P→ and Q→ is R→ such that R→=P→. Find the angle between resultant of 2P→ and Q→ and Q→ , ________

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Show full solutionCorrect answer: 90
Correct answer
90

Step-by-step explanation


So angle between 2P→+Q→ and Q→ is 90o


Alternate solution


P→+Q→=P→
P2+Q2+2PQcos⁡θ=P2
⇒Q+2PQcos⁡θ=O
⇒cos⁡θ=-Q2P

tan⁡α=2Psin⁡θ2Pcos⁡θ+Q=∞
∵2Pcos⁡θ+Q=0
α=90o

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About this question

This is a previous-year question from JEE Main 2020, 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.