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Saturday, 31 October

JEE Main · Physics · Moving Charges and Magnetism

Field at Center of Spiral Coil

JEE Main asked Field at Center of Spiral Coil 2 times in 2 of the 108 shifts Lumi analysed, in 2021 and 2022. It belongs to Biot-Savart Law, in Moving Charges and Magnetism (Physics). The longest wait between two years asking it was 1 year.

Updated 2026-10-24

Times asked
2
in 2 shifts
Years
2 of 8
First asked
2021
last in 2022
Pattern
Occasional
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2021 and 2022. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Physics questions.

00.050.10’170’200.03’210.03’220’230’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 1 in 24 shifts · 2022: 1 in 24 shifts · 2023: 0 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
  • 20230 of 12
  • 20221 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

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

  • Magnetic field at centre of spiral coil
  • Field at centre of flat spiral coil

Difficulty

Easy 0Medium 1Hard 1

Every question was multiple choice.

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. 30 Jun 2022, Shift 1 · Q39A coil of n number of turns wound tightly in the form of a spiral with inner and outer radii r1\mathrm{r_1} and r2\mathrm{r_2}…MediumSingle correct
  2. 31 Aug 2021, Shift 1 · Q10A coil having N turns is wound tightly in the form of a spiral with inner and outer radii 'a' and 'b' respectively. Find the magnetic…HardSingle correct

Shifts: 31 Aug 2021, Shift 1, 30 Jun 2022, 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