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Saturday, 31 October

JEE Main · Physics · Units and Measurements

Dimensions of Permeability

JEE Main asked Dimensions of Permeability 3 times in 3 of the 108 shifts Lumi analysed, in 2021 and 2025. It belongs to Biot-Savart Law, in Units and Measurements (Physics). The longest wait between two years asking it was 4 years. In 2021 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
3
in 3 shifts
Years
2 of 8
First asked
2021
last in 2025
Pattern
Occasional
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2021 and 2025. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Physics questions.

00.10.20’170’200.07’210’220’230’240.13’250’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 2 in 24 shifts · 2022: 0 in 24 shifts · 2023: 0 in 12 shifts · 2024: 0 in 18 shifts · 2025: 1 in 8 shifts · 2026: 0 in 9 shifts.

Shift by shift

Each square is one analysed shift, in date order. Open a filled one for that paper.

  • 20260 of 9
  • 20251 of 8
  • 20240 of 18
  • 20230 of 12
  • 20220 of 24
  • 20212 of 24
  • 20200 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Single correct is the usual form. Skill tested: conceptual.

  • Dimension of physical quantity from formula
  • Odd-one-out among dimensionless quantities

Difficulty

Easy 1Medium 2Hard 0

Every question was multiple choice.

Every question

All 3 questions

From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.

  1. 2 Apr 2025, Shift 2 · Q27Given a charge qq, current II and permeability of vacuum μ0\mu_0. Which of the following quantity has the dimension of momentum ?MediumSingle correct
  2. 27 Aug 2021, Shift 1 · Q5Which of the following is not a dimensionless quantity ?EasySingle correct
  3. 26 Aug 2021, Shift 2 · Q1Match List - I with List - II : List - I List - II (a) Magnetic Induction (i) ML2T−2A−1\mathrm{ML^2T^{-2}A^{-1}} (b) Magnetic Flux (ii)…MediumMatch the list

Shifts: 26 Aug 2021, Shift 2, 27 Aug 2021, Shift 1, 2 Apr 2025, Shift 2.

Same topic

Other ideas in Biot-Savart Law

Biot-Savart Law has 11 ideas JEE Main has asked; 9 of them came up in more than one question.

Topic analysisChapter analysisStudy this chapterAll repeated ideas