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Saturday, 31 October

JEE Main · Physics · Current Electricity

Comparing EMF of Two Cells

JEE Main asked Comparing EMF of Two Cells 4 times in 4 of the 108 shifts Lumi analysed, in 2021 and 2022. It belongs to Potentiometer, in Current Electricity (Physics). The longest wait between two years asking it was 1 year. In 2021 and 2022 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
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.

00.050.10’170’200.07’210.07’220’230’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 2 in 24 shifts · 2022: 2 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
  • 20222 of 24
  • 20212 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.

  • Balancing length from emf ratio
  • Balance length change on replacing cell

Difficulty

Easy 3Medium 1Hard 0

3 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. 24 Jun 2022, Shift 1 · Q59In a potentiometer arrangement, a cell gives a balancing point at 75 cm length of wire. This cell is now replaced by another cell of…EasyNumerical value
  2. 25 Jul 2022, Shift 2 · Q55In a potentiometer arrangement, a cell of emf 1.20 V gives a balance point at 36 cm length of wire. This cell is now replaced by another…EasyNumerical value
  3. 25 Jul 2021, Shift 2 · Q20In the given potentiometer circuit arrangement, the balancing length AC is measured to be 250 cm. When the galvanometer connection is…MediumDiagram basedHas a figure
  4. 25 Feb 2021, Shift 1 · Q30In the given circuit of potentiometer, the potential difference E across AB (10 m length) is larger than E1E_1 and E2E_2 as well. For key…EasyNumerical valueHas a figure

Shifts: 25 Feb 2021, Shift 1, 25 Jul 2021, Shift 2, 24 Jun 2022, Shift 1, 25 Jul 2022, Shift 2.

Same topic

Other ideas in Potentiometer

Potentiometer has 4 ideas JEE Main has asked; 3 of them came up in more than one question.

Topic analysisChapter analysisStudy this chapterAll repeated ideas