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Saturday, 31 October

JEE Main · Physics · Current Electricity

Series Combination of Cells

JEE Main asked Series Combination of Cells 4 times in 4 of the 108 shifts Lumi analysed, in 2020, 2021, 2022 and 2025. It belongs to Kirchhoff's Laws, in Current Electricity (Physics). The longest wait between two years asking it was 3 years.

Updated 2026-10-24

Times asked
4
in 4 shifts
Years
4 of 8
First asked
2020
last in 2025
Pattern
Comes in cycles
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2020, 2021, 2022 and 2025. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Physics questions.

00.10.20’170.08’200.03’210.03’220’230’240.13’250’26

Raw count: 2017: 0 in 1 shift · 2020: 1 in 12 shifts · 2021: 1 in 24 shifts · 2022: 1 in 24 shifts · 2023: 0 in 12 shifts · 2024: 0 in 18 shifts · 2025: 1 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
  • 20251 of 8
  • 20240 of 18
  • 20230 of 12
  • 20221 of 24
  • 20211 of 24
  • 20201 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: multi-step.

  • Current ratio for cells in series vs parallel
  • Condition for zero potential across a cell

Difficulty

Easy 0Medium 4Hard 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. 3 Apr 2025, Shift 2 · Q48Two cells of emfs 1 V and 2 V and internal resistances 2 Ω2\ \Omega and 1 Ω1\ \Omega, respectively, are connected in series with an external…MediumNumerical value
  2. 25 Jun 2022, Shift 2 · Q39Two cells of same emf but different internal resistances r1r_1 and r2r_2 are connected in series with a resistance RR. The value of…MediumSingle correct
  3. 27 Aug 2021, Shift 1 · Q12Five identical cells each of internal resistance 1 Ω\Omega and emf 5 V are connected in series and in parallel with an external…MediumSingle correct
  4. 8 Jan 2020, Shift 2 · Q24The series combination of two batteries, both of the same emf 10 V10\ \mathrm{V}, but different internal resistance of 20 Ω20\ \Omega and…MediumNumerical value

Shifts: 8 Jan 2020, Shift 2, 27 Aug 2021, Shift 1, 25 Jun 2022, Shift 2, 3 Apr 2025, Shift 2.

Same topic

Other ideas in Kirchhoff's Laws

Kirchhoff's Laws has 22 ideas JEE Main has asked; 14 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisStudy this chapterAll repeated ideas