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Saturday, 31 October

JEE Main · Physics · Current Electricity

Resistivity and Geometry

JEE Main asked Resistivity and Geometry 10 times in 10 of the 108 shifts Lumi analysed, in 2020, 2021, 2022 and 2023. It belongs to Ohm's Law and Resistance, in Current Electricity (Physics). The longest wait between two years asking it was 1 year. In 2021, 2022 and 2023 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
10
in 10 shifts
Years
4 of 8
First asked
2020
last in 2023
Pattern
Comes in cycles
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2020, 2021, 2022 and 2023. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Physics questions.

00.10.20’170.08’200.14’210.10’220.14’230’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 1 in 12 shifts · 2021: 4 in 24 shifts · 2022: 3 in 24 shifts · 2023: 2 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
  • 20232 of 12
  • 20223 of 24
  • 20214 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: calculation.

  • Percentage change in resistance
  • New diameter for equal resistance

Difficulty

Easy 6Medium 4Hard 0

5 of the 10 questions had a numerical answer.

Every question

All 10 questions

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

  1. 10 Apr 2023, Shift 2 · Q60A rectangular parallelopiped is measured as 1 cm ×\times 1 cm ×\times 100 cm. If its specific resistance is 3×10−7 Ω3\times10^{-7}\ \Omega m,…EasyNumerical value
  2. 6 Apr 2023, Shift 1 · Q55The length of a metallic wire is increased by 20% and its area of cross section is reduced by 4%. The percentage change in resistance of…EasyNumerical value
  3. 30 Jun 2022, Shift 1 · Q45An electric cable of copper has just one wire of radius 9 mm. Its resistance is 14 Ω\Omega. If this single copper wire of the cable is…EasySingle correct
  4. 29 Jul 2022, Shift 1 · Q42Two metallic wires of identical dimensions are connected in series. If σ1\sigma_1 and σ2\sigma_2 are the conductivities of the these wires…MediumSingle correct
  5. 25 Jul 2022, Shift 1 · Q58Eight copper wire of length ll and diameter dd are joined in parallel to form a single composite conductor of resistance RR. If a…EasyNumerical value
  6. 18 Mar 2021, Shift 2 · Q23Two wires of same length and thickness having specific resistances 6 Ω\Omega cm and 3 Ω\Omega cm respectively are connected in parallel.…EasyNumerical value
  7. 22 Jul 2021, Shift 2 · Q7A Copper (Cu) rod of length 25 cm and cross-sectional area 3 mm2^2 is joined with a similar Aluminium (Al) rod as shown in figure. Find…EasySingle correctHas a figure
  8. 26 Aug 2021, Shift 1 · Q17What equal length of an iron wire and a copper-nickel alloy wire, each of 2 mm diameter connected parallel to give an equivalent…MediumSingle correct
  9. 4 Aug 2021, Shift 1 · Q21A wire of length L is coated by another conducting material of double resistivity and the thickness of the layer is equal to the radius of…MediumNumerical valueHas a figure
  10. 2 Sep 2020, Shift 1 · Q12Consider four conducting materials copper, tungsten, mercury and aluminium with resistivity ρC\rho_C, ρT\rho_T, ρM\rho_M and ρA\rho_A…MediumSingle correct

Shifts: 2 Sep 2020, Shift 1, 18 Mar 2021, Shift 2, 22 Jul 2021, Shift 2, 4 Aug 2021, Shift 1, 26 Aug 2021, Shift 1, 30 Jun 2022, Shift 1, 25 Jul 2022, Shift 1, 29 Jul 2022, Shift 1, 6 Apr 2023, Shift 1, 10 Apr 2023, Shift 2.

Same topic

Other ideas in Ohm's Law and Resistance

Ohm's Law and Resistance has 21 ideas JEE Main has asked; 12 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisStudy this chapterAll repeated ideas