JEE Main 2021 · PhysicsMultiple choiceSingle correctEasyConceptual

JEE Main 27 August 2021, Shift 1, Physics Q5

Question 5 of 90 in this shift, Physics question 5 of 30, Section A.

Which of the following is not a dimensionless quantity ?

(1)Quality factor
(2)Power factor
(3)Relative magnetic permeability ( $\mu_r$ )
(4)Permeability of free space ( $\mu_0$ )Official answer

Official answer

Option 4

NTA final key.

Chapter: Units and Measurements
Topic: Biot-Savart Law
Idea tested: Dimensions of Permeability

Same idea in other shifts

Asked 3× in all

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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. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.