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Friday, 9 October

JEE Main 2022 · PhysicsMultiple choiceSingle correctEasyConceptual

JEE Main 28 July 2022, Shift 1, Physics Q31

Question 31 of 90 in this shift, Physics question 1 of 30, Section A.

The dimensions of (B2μ0)\left(\frac{B^2}{\mu_0}\right) will be : (if μ0\mu_0 : permeability of free space and B : magnetic field)
  1. (1)[M L2 T−2][\mathrm{M\,L^2\,T^{-2}}]
  2. (2)[M L T−2][\mathrm{M\,L\,T^{-2}}]
  3. (3)[M L−1 T−2][\mathrm{M\,L^{-1}\,T^{-2}}]Official answer
  4. (4)[M L2 T−2 A−1][\mathrm{M\,L^2\,T^{-2}\,A^{-1}}]

Official answer

Option 3

NTA final key (2022 Session 2).

Chapter
Units and Measurements
Topic
Inductance
Idea tested
Magnetic Energy Density

Same idea in other shifts

Asked 2× in all
  1. 2 Apr 2025, Shift 2 · Q43A solenoid having area AA and length ll is filled with a material having relative permeability 2. The magnetic energy stored in the…MediumSingle correct

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 42 of the 174 JEE Main shifts held from 2017 to 2026.