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Saturday, 31 October

JEE Main · Physics · Moving Charges and Magnetism

Infinite and semi-infinite wires

JEE Main asked Infinite and semi-infinite wires 4 times in 4 of the 108 shifts Lumi analysed, in 2022 and 2024. It belongs to Biot-Savart Law, in Moving Charges and Magnetism (Physics). The longest wait between two years asking it was 2 years. In 2022 and 2024 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
4
in 4 shifts
Years
2 of 8
First asked
2022
last in 2024
Pattern
Occasional
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2022 and 2024. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Physics questions.

00.050.10’170’200’210.07’220’230.09’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 0 in 24 shifts · 2022: 2 in 24 shifts · 2023: 0 in 12 shifts · 2024: 2 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
  • 20242 of 18
  • 20230 of 12
  • 20222 of 24
  • 20210 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 between opposite-current wires
  • Field ratio at points near two parallel current wires

Difficulty

Easy 1Medium 3Hard 0

2 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. 27 Jan 2024, Shift 1 · Q57Two long, straight wires carry equal currents in opposite directions as shown in figure. The separation between the wires is 5.0 cm. The…EasyNumerical valueHas a figure
  2. 4 Apr 2024, Shift 2 · Q54Two parallel long current carrying wire separated by a distance 2r2r are shown in the figure. The ratio of magnetic field at AA to the…MediumNumerical valueHas a figure
  3. 29 Jun 2022, Shift 2 · Q39Two long current carrying conductors are placed parallel to each other at a distance of 8 cm between them. The magnitude of magnetic field…MediumSingle correct
  4. 29 Jul 2022, Shift 2 · Q36A wire X of length 50 cm carrying a current of 2 A is placed parallel to a long wire Y of length 5 m. The wire Y carries a current of 3 A.…MediumDiagram basedHas a figure

Shifts: 29 Jun 2022, Shift 2, 29 Jul 2022, Shift 2, 27 Jan 2024, Shift 1, 4 Apr 2024, 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