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Saturday, 31 October

JEE Main · Physics · Moving Charges and Magnetism

Field on axis of circular loop

JEE Main asked Field on axis of circular loop 2 times in 2 of the 108 shifts Lumi analysed, in 2021 and 2023. It belongs to Biot-Savart Law, in Moving Charges and Magnetism (Physics). The longest wait between two years asking it was 2 years.

Updated 2026-10-24

Times asked
2
in 2 shifts
Years
2 of 8
First asked
2021
last in 2023
Pattern
Occasional
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2021 and 2023. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Physics questions.

00.050.10’170’200.03’210’220.07’230’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 1 in 24 shifts · 2022: 0 in 24 shifts · 2023: 1 in 12 shifts · 2024: 0 in 18 shifts · 2025: 0 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
  • 20250 of 8
  • 20240 of 18
  • 20231 of 12
  • 20220 of 24
  • 20211 of 24
  • 20200 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Numerical value is the usual form. Skill tested: calculation.

  • Field at centre due to orbiting electron
  • Radius of coil from axial field ratio

Difficulty

Easy 0Medium 2Hard 0

1 of the 2 questions had a numerical answer.

Every question

All 2 questions

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

  1. 15 Apr 2023, Shift 1 · Q59An election in a hydrogen atom revolves around its nucleus with a speed of 6.76×1066.76 \times 10^6 ms−1^{-1} in an orbit of radius 0.52…MediumNumerical value
  2. 25 Feb 2021, Shift 1 · Q16Magnetic fields at two points on the axis of a circular coil at a distance of 0.05 m and 0.2 m from the centre are in the ratio 8 : 1. The…MediumSingle correct

Shifts: 25 Feb 2021, Shift 1, 15 Apr 2023, Shift 1.

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