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Saturday, 31 October

JEE Main · Physics · Electric Charges and Fields

Surface Charge Density Ratio of Connected Spheres

JEE Main asked Surface Charge Density Ratio of Connected Spheres 2 times in 2 of the 108 shifts Lumi analysed, in 2022 and 2025. It belongs to Conductors in Fields, in Electric Charges and Fields (Physics). The longest wait between two years asking it was 3 years.

Updated 2026-10-24

Times asked
2
in 2 shifts
Years
2 of 8
First asked
2022
last in 2025
Pattern
Occasional
across the analysed shifts

Questions on this idea a shift, by year

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

00.10.20’170’200’210.03’220’230’240.13’250’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 0 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
  • 20210 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.

  • Charge density ratio after contact
  • Field ratio on connected conducting spheres

Difficulty

Easy 1Medium 1Hard 0

Every question was multiple choice.

Every question

All 2 questions

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

  1. 8 Apr 2025, Shift 2 · Q38Two metal spheres of radius R and 3R have same surface charge density σ\sigma. If they are brought in contact and then separated, the…EasySingle correct
  2. 26 Jul 2022, Shift 2 · Q35Two uniformly charged spherical conductors AA and BB of radii 5 mm and 10 mm are separated by a distance of 2 cm. If the spheres are…MediumSingle correct

Shifts: 26 Jul 2022, Shift 2, 8 Apr 2025, Shift 2.

Same topic

Other ideas in Conductors in Fields

Conductors in Fields has 10 ideas JEE Main has asked; 3 of them came up in more than one question.

Topic analysisChapter analysisStudy this chapterAll repeated ideas