Learn

Saturday, 31 October

JEE Main · Physics · Moving Charges and Magnetism

Field of an N-Turn Flat Coil

JEE Main asked Field of an N-Turn Flat Coil 4 times in 4 of the 108 shifts Lumi analysed, in 2021, 2022 and 2026. It belongs to Biot-Savart Law, in Moving Charges and Magnetism (Physics). The longest wait between two years asking it was 4 years. In 2022 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
4
in 4 shifts
Years
3 of 8
First asked
2021
last in 2026
Pattern
Frequent
across the analysed shifts

Questions on this idea a shift, by year

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

00.10.20’170’200.03’210.07’220’230’240’250.11’26

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

Shift by shift

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

  • 20261 of 9
  • 20250 of 8
  • 20240 of 18
  • 20230 of 12
  • 20222 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 energy in small volume at loop centre
  • Current from field at centre of coil

Difficulty

Easy 2Medium 2Hard 0

1 of the 4 questions had a numerical answer.

Every question

All 4 questions

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

  1. 6 Apr 2026, Shift 1 · Q42A small cube of side 1 mm is placed at the centre of a circular loop of radius 10 cm carrying a current of 2 A. The magnetic energy stored…MediumSingle correct
  2. 29 Jul 2022, Shift 1 · Q56A closely wounded circular coil of radius 5 cm produces a magnetic field of 37.68×10−437.68 \times 10^{-4} T at its center. The current through…EasyNumerical value
  3. 25 Jul 2022, Shift 2 · Q32The electric current in a circular coil of 2 turns produces a magnetic induction B1\mathrm{B_1} at its centre. The coil is unwound and is…MediumSingle correct
  4. 4 Aug 2021, Shift 2 · Q7The same current is passed through two identical conducting wires of the same length L. One of them, w1\mathrm{w_1}, is bent in the form…EasySingle correct

Shifts: 4 Aug 2021, Shift 2, 25 Jul 2022, Shift 2, 29 Jul 2022, Shift 1, 6 Apr 2026, 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