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Saturday, 31 October

JEE Main · Physics · Electromagnetic Induction

AC Generator Principle

JEE Main asked AC Generator Principle 5 times in 5 of the 108 shifts Lumi analysed, in 2020, 2021, 2022 and 2024. It belongs to Faraday's Law, in Electromagnetic Induction (Physics). The longest wait between two years asking it was 2 years. In 2020 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
5
in 5 shifts
Years
4 of 8
First asked
2020
last in 2024
Pattern
Comes in cycles
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2020, 2021, 2022 and 2024. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Physics questions.

00.10.20’170.17’200.03’210.03’220’230.05’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 2 in 12 shifts · 2021: 1 in 24 shifts · 2022: 1 in 24 shifts · 2023: 0 in 12 shifts · 2024: 1 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
  • 20241 of 18
  • 20230 of 12
  • 20221 of 24
  • 20211 of 24
  • 20202 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.

  • Maximum emf of rotating coil
  • Peak emf of coil rotating in field

Difficulty

Easy 3Medium 2Hard 0

4 of the 5 questions had a numerical answer.

Every question

All 5 questions

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

  1. 1 Feb 2024, Shift 2 · Q58A coil of 200 turns and area 0.20 m20.20\ \mathrm{m^2} is rotated at half a revolution per second and is placed in uniform magnetic field of…EasyNumerical value
  2. 24 Jun 2022, Shift 2 · Q58A circular coil of 1000 turns each with area 1m2^2 is rotated about its vertical diameter at the rate of one revolution per second in a…EasyNumerical value
  3. 26 Aug 2021, Shift 2 · Q28A circular coil of radius 8.0 cm and 20 turns is rotated about its vertical diameter with an angular speed of 50 rad s−1^{-1} in a uniform…EasyNumerical value
  4. 3 Sep 2020, Shift 1 · Q14An elliptical loop having resistance R, of semi major axis a, and semi minor axis b is placed in a magnetic field as shown in the figure.…MediumSingle correctHas a figure
  5. 2 Sep 2020, Shift 1 · Q24A circular coil of radius 10 cm is placed in a uniform magnetic field of 3.0×10−53.0\times10^{-5} T with its plane perpendicular to the field…MediumNumerical value

Shifts: 2 Sep 2020, Shift 1, 3 Sep 2020, Shift 1, 26 Aug 2021, Shift 2, 24 Jun 2022, Shift 2, 1 Feb 2024, Shift 2.

Same topic

Other ideas in Faraday's Law

Faraday's Law has 13 ideas JEE Main has asked; 7 of them came up in more than one question.

Topic analysisChapter analysisStudy this chapterAll repeated ideas