JEE Main · Physics · Electromagnetic Induction
Lenz's Law: JEE Main previous year questions
6 questions in the 108 JEE Main shifts Lumi analysed, in 4 of 8 years. Pattern: Comes in cycles. 0 came in 2024–26. Here is how it is asked and which ideas come back.
- Questions
- 6
- in 6 of 108 shifts
- Years asked
- 4/8
- last asked 2023
- Weighted estimate
- 0.0
- model; history: 0.0 a shift on average, typically 0.0–0.1
Key findings
- 01
Asked in 4 of 8 years with analysed shifts and in 6 of 108 shifts: 6 questions, #187 of 196 topics. Last asked in 2023.
- 02
83% of its questions since 2020 tested an idea no earlier year had asked; none repeated an idea from the year before.
- 03
The most repeated idea is Bar Magnet and Loop Interaction, asked 2 times in 2 shifts (2020, 2023), most often as “magnet falling through conducting tube”.
- 04
JEE Main has asked 5 of the 58 ideas in this topic; 52 have never been asked, directly or inside another question.
- 05
Mostly asked as single correct (50%); 0% need a numerical answer, 33% are easy and 33% hard.
- 06
The skill tested most is conceptual (50%), then multi-step (17%).
Questions a shift, year by year
Out of the 25 Physics questions in a shift. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift.
Raw count: 2017: 0 in 1 shift · 2020: 1 in 12 shifts · 2021: 2 in 24 shifts · 2022: 1 in 24 shifts · 2023: 2 in 12 shifts · 2024: 0 in 18 shifts · 2025: 0 in 8 shifts · 2026: 0 in 9 shifts.
- Up to 2023
- 0.1
- a shift, of 25
- Since 2024
- 0.0
- -0.1
- Usual gap
- 1.0 yrs
- between years asking it
- Shifts with it
- 6/108
- 6% of analysed shifts
How it is asked
Difficulty, format and skill
Across all 6 questions on Lenz's Law since 2017.
Difficulty
QUESTIONS- Easy2 · 33%
- Medium2 · 33%
- Hard2 · 33%
Format
SHARE- Single correct · 3 Q50%
- Diagram based · 2 Q33%
- Assertion–reason · 1 Q17%
Skill tested
SHARE- Conceptual · 3 Q50%
- Multi-step · 1 Q17%
- Data or graph · 1 Q17%
- Diagram reading · 1 Q17%
Repeats
New idea, or one asked before?
Each column is a year. Blue questions tested an idea no earlier year had asked; navy ones went back to an idea from an earlier year. 2017 is the first year, so everything in it counts as new. Heights are question counts, and Lumi analysed 1 to 24 shifts a year, so compare the split inside a column rather than heights across years.
- Idea asked for the first time
- Idea asked in an earlier year
Coverage of the topic
JEE Main has asked 5 of the 58 ideas in this topic. 52 have never been asked yet.
- Asked directly5 · 9%
- Touched inside another question1 · 2%
- Never asked52 · 90%
Ideas come from Lumi’s JEE syllabus map. A never-asked idea is not a safe skip: across all of JEE Main, 22% of questions since 2024 tested an idea no earlier year had asked.
Drill down
Idea, year, question
Every idea JEE Main tested in this topic, with its eight years. Open one to read the questions.
- 10 Apr ’23 S2 · Q46A bar magnet is released from rest along the axis of a very long vertical copper tube. After some time the magnet will
mediumSingle correct
- 4 Sep ’20 S1 · Q15A small bar magnet is moved through a coil at constant speed from one end to the other. Which of the following series of observations will…
mediumDiagram basedNew idea
- 10 Apr ’23 S2 · Q46
Squares are the 8 years with analysed shifts, 2017 to 2026. A number is the questions that year when there is more than one; the shade is scaled to one shift, so a year with more analysed shifts (1 to 24 a year) does not look darker. Share is of the level above.
Ideas
Every idea inside this topic
5 different ideas were tested; 1 came more than once.
magnet falling through conducting tube
Diagram based · 2 shiftsassertion-reason on magnet falling in conducting pipe
Assertion–reason · 1 shifttime to half current and stored energy in lr circuit
Single correct · 1 shiftemf-time graph for magnet passing through loop
Single correct · 1 shiftcondition for induced current in coil
Diagram based · 1 shift
| Idea | Years asked | Times | Shifts | Format | Numerical |
|---|---|---|---|---|---|
| Bar Magnet and Loop Interactionmagnet falling through conducting tube | 2 | 2 | Diagram basedConceptual | – | |
| Magnet Falling in a Conducting Tubeassertion-reason on magnet falling in conducting pipe | 1 | 1 | Assertion–reasonConceptual | – | |
| Opposing Current Growth and Decaytime to half current and stored energy in lr circuit | 1 | 1 | Single correctMulti-step | – | |
| Current Reversal During Magnet Pass-Throughemf-time graph for magnet passing through loop | 1 | 1 | Single correctData or graph | – | |
| Identifying Magnetic Flux Changecondition for induced current in coil | 1 | 1 | Diagram basedConceptual | – |
Times and shifts count every analysed shift. Across JEE Main, 78% of questions since 2024 went back to an idea an earlier year had asked; the rest were new. All repeated ideas
Every question
Lenz's Law questions, year by year
The opening words of each question as it appeared in the official paper, with the idea it tested. Open one for its options and the official answer.
JEE Main 20232 questions in 2 shifts
- 10 Apr, Shift 2Q46A bar magnet is released from rest along the axis of a very long vertical copper tube. After some time the magnet will
Idea: Bar Magnet and Loop Interaction
MediumSingle correct - 11 Apr, Shift 2Q47Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A: A bar magnet dropped…
Idea: Magnet Falling in a Conducting Tube
New ideaEasyAssertion–reason
JEE Main 20221 question in 1 shift
- 29 Jul, Shift 1Q44A coil of inductance 1 H and resistance 100 is connected to a battery of 6 V. Determine approximately : (a) The time elapsed…
Idea: Opposing Current Growth and Decay
New ideaHardSingle correct
JEE Main 20212 questions in 2 shifts
- 27 Aug, Shift 1Q14A bar magnet is passing through a conducting loop of radius R with velocity . The radius of the bar magnet is such that it just passes…
Idea: Current Reversal During Magnet Pass-Through
New ideaHardSingle correct · figure - 31 Aug, Shift 2Q15A coil is placed in a magnetic field as shown below : A current is induced in the coil because is :
Idea: Identifying Magnetic Flux Change
New ideaEasyDiagram based · figure
JEE Main 20201 question in 1 shift
- 4 Sep, Shift 1Q15A small bar magnet is moved through a coil at constant speed from one end to the other. Which of the following series of observations will…
Idea: Bar Magnet and Loop Interaction
New ideaMediumDiagram based · figure
Questions from the official JEE Main Paper 1 shifts published by NTA (CBSE for 2017). Questions NTA dropped are left out. Topic and idea tags, counts and notes are Lumi’s.