JEE Main · Physics · Moving Charges and Magnetism
Lorentz Force: JEE Main previous year questions
51 questions in the 108 JEE Main shifts Lumi analysed, in 7 of 8 years. Pattern: Asked most years. 16 came in 2024–26. Here is how it is asked and which ideas come back.
- Questions
- 51
- in 48 of 108 shifts
- Years asked
- 7/8
- last asked 2026
- Weighted estimate
- 0.4
- model; history: 0.4 a shift on average, typically 0.3–0.6
Key findings
- 01
Asked in 7 of 8 years with analysed shifts and in 48 of 108 shifts: 51 questions, #55 of 196 topics.
- 02
41% of its questions since 2020 tested an idea no earlier year had asked; 16 repeated an idea from the year before.
- 03
The most repeated idea is Helical Motion and Pitch, asked 7 times in 7 shifts (2020, 2023, 2024, 2026), most often as “pitch of helical path”.
- 04
JEE Main has asked 18 of the 61 ideas in this topic; 40 have never been asked, directly or inside another question.
- 05
Mostly asked as single correct (57%); 24% need a numerical answer, 47% are easy and 6% hard.
- 06
The skill tested most is calculation (37%), then application (20%).
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: 8 in 12 shifts · 2021: 8 in 24 shifts · 2022: 15 in 24 shifts · 2023: 4 in 12 shifts · 2024: 7 in 18 shifts · 2025: 4 in 8 shifts · 2026: 5 in 9 shifts.
- Up to 2023
- 0.3
- a shift, of 25
- Since 2024
- 0.5
- 0.1
- Usual gap
- 1.0 yrs
- between years asking it
- Shifts with it
- 48/108
- 44% of analysed shifts
Recent framings
- numerical: pitch of helical path
- numerical: unknown component from perpendicular force
- kinetic energy change in combined E and B fields
Revise first
- Magnetic Force Vector Calculation · asked 2020, 2021, 2022, 2026
- Helical Motion and Pitch · asked 2020, 2023, 2024, 2026
- Circular Motion in Uniform B-Field · asked 2020, 2021, 2022, 2025
How it is asked
Difficulty, format and skill
Across all 51 questions on Lorentz Force since 2017.
Difficulty
QUESTIONS- Easy24 · 47%
- Medium24 · 47%
- Hard3 · 6%
Format
SHARE- Single correct · 29 Q57%
- Numerical value · 12 Q24%
- Other · 4 Q8%
- Diagram based · 3 Q6%
- Assertion–reason · 2 Q4%
- Two statements · 1 Q2%
Skill tested
SHARE- Calculation · 19 Q37%
- Application · 10 Q20%
- Multi-step · 10 Q20%
- Conceptual · 9 Q18%
- Recall · 2 Q4%
- Data or graph · 1 Q2%
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 18 of the 61 ideas in this topic. 40 have never been asked yet.
- Asked directly18 · 30%
- Touched inside another question3 · 5%
- Never asked40 · 66%
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
Chapter, idea, question
Every idea JEE Main tested in this topic, with its eight years. Open one to read the questions.
18 ideas inside
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
18 different ideas were tested; 9 came more than once.
pitch of helical path
Single correct · 7 shifts · 2 numericalmagnetic force from vector cross product
Single correct · 7 shifts · 2 numericaldisplacement of charge crossing two magnetic regions
Single correct · 7 shifts · 1 numericalmaximum kinetic energy in cyclotron
Numerical value · 4 shifts · 2 numericalratio of radii for same kinetic energy
Single correct · 4 shifts · 1 numericalelectric field for undeflected electron
Numerical value · 4 shifts · 2 numericalvelocity from net lorentz force vector
Single correct · 3 shiftsgraph interpretation of radius versus kinetic energy
Single correct · 3 shiftswork done by magnetic force
Assertion–reason · 3 shiftskinetic energy change in combined e and b fields
Single correct · 1 shiftassertion-reason on radius of charged particles
Assertion–reason · 1 shiftfield to levitate current-carrying wire
Numerical value · 1 shift · 1 numericalfield component from magnetic force vector
Numerical value · 1 shift · 1 numericalcount correct statements on force on moving charge
Other · 1 shiftratio of momenta of particles accelerated through same potential
Single correct · 1 shiftradii ratio of alpha and proton at same velocity
Single correct · 1 shiftratio of speeds of ions accelerated through same potential
Single correct · 1 shiftcount correct statements on charge in e and b fields
Other · 1 shift
| Idea | Years asked | Times | Shifts | Format | Numerical |
|---|---|---|---|---|---|
| Helical Motion and Pitchpitch of helical path | 7 | 7 | Single correctCalculation | 2 | |
| Magnetic Force Vector Calculationmagnetic force from vector cross product | 7 | 7 | Single correctApplication | 2 | |
| Circular Motion in Uniform B-Fielddisplacement of charge crossing two magnetic regions | 7 | 7 | Single correctCalculation | 1 | |
| Cyclotron Frequency and Energymaximum kinetic energy in cyclotron | 4 | 4 | Numerical valueCalculation | 2 | |
| Trajectory Radii Ratio for Same Kinetic Energyratio of radii for same kinetic energy | 4 | 4 | Single correctCalculation | 1 | |
| Velocity Selector and Crossed Fieldselectric field for undeflected electron | 4 | 4 | Numerical valueMulti-step | 2 | |
| Lorentz Force Vector Summationvelocity from net lorentz force vector | 3 | 3 | Single correctCalculation | – | |
| Radius-Kinetic Energy Proportionalitygraph interpretation of radius versus kinetic energy | 3 | 3 | Single correctApplication | – | |
| Work Done by Magnetic Forcework done by magnetic force | 3 | 3 | Assertion–reasonConceptual | – | |
| Kinetic Energy Change in Combined E and B Fieldskinetic energy change in combined e and b fields | 1 | 1 | Single correctApplication | – | |
| Radius-Momentum Proportionalityassertion-reason on radius of charged particles | 1 | 1 | Assertion–reasonConceptual | – | |
| Balancing Gravity with Magnetic Forcefield to levitate current-carrying wire | 1 | 1 | Numerical valueMulti-step | 1 | |
| Determinant Form of Magnetic Forcefield component from magnetic force vector | 1 | 1 | Numerical valueCalculation | 1 | |
| Magnetic Force Direction Rulescount correct statements on force on moving charge | 1 | 1 | OtherApplication | – | |
| Radius-Accelerating Voltage Proportionalityratio of momenta of particles accelerated through same potential | 1 | 1 | Single correctApplication | – | |
| Trajectory Radii Ratio for Same Velocityradii ratio of alpha and proton at same velocity | 1 | 1 | Single correctCalculation | – | |
| Trajectory Radii Ratio for Same Accelerating Potentialratio of speeds of ions accelerated through same potential | 1 | 1 | Single correctCalculation | – | |
| Work-Energy Theorem in Combined E and B Fieldscount correct statements on charge in e and b fields | 1 | 1 | OtherMulti-step | – |
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
Lorentz Force questions, year by year
The newest 40 show their opening words as they appeared in the official paper; older ones name the idea they tested. Open one for its options and the official answer.
JEE Main 20265 questions in 5 shifts
- 2 Apr, Shift 1Q48C charge moving with velocity m/s in the region of magnetic field…
Idea: Magnetic Force Vector Calculation
EasyNumerical value - 2 Apr, Shift 2Q29A particle having charge C moving in - plane in fields of N/C and T experiences a…
Idea: Lorentz Force Vector Summation
MediumSingle correct - 5 Apr, Shift 1Q49The charged particle moving in a uniform magnetic field of has an acceleration…
Idea: Magnetic Force Vector Calculation
MediumNumerical value - 5 Apr, Shift 2Q38A particle of charge and mass is projected from origin with an initial velocity…
Idea: Kinetic Energy Change in Combined E and B Fields
New ideaMediumSingle correct - 8 Apr, Shift 2Q48A 5 mg particle carrying a charge of C is moving with velocity of …
Idea: Helical Motion and Pitch
MediumNumerical value
JEE Main 20254 questions in 3 shifts
- 3 Apr, Shift 2Q40Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A : If Oxygen ion…
Idea: Radius-Momentum Proportionality
New ideaMediumAssertion–reason - 4 Apr, Shift 2Q49A particle of charge 1.6 C and mass 16 g is present in a strong magnetic field of 6.28 T. The particle is then fired…
Idea: Cyclotron Frequency and Energy
EasyNumerical value - 7 Apr, Shift 1Q37A particle of charge q, mass m and kinetic energy E enters in magnetic field perpendicular to its velocity and undergoes a circular arc of…
Idea: Radius-Kinetic Energy Proportionality
EasyDiagram based · figure - 7 Apr, Shift 1Q40Uniform magnetic fields of different strengths ( and ), both normal to the plane of the paper exist as shown in the figure. A…
Idea: Circular Motion in Uniform B-Field
HardDiagram based · figure
JEE Main 20247 questions in 7 shifts
- 4 Apr, Shift 1Q42An electron is projected with uniform velocity along the axis inside a current carrying long solenoid. Then :
Idea: Helical Motion and Pitch
Asked the year beforeEasySingle correct - 5 Apr, Shift 1Q56A 2A current carrying straight metal wire of resistance , resistivity , area of cross-section…
Idea: Balancing Gravity with Magnetic Force
New ideaMediumNumerical value - 5 Apr, Shift 2Q43The electrostatic force and magnetic force acting on a charge q moving with velocity …
Idea: Lorentz Force Vector Summation
EasySingle correct - 8 Apr, Shift 1Q57An electron with kinetic energy 5 eV enters a region of uniform magnetic field of 3 T perpendicular to its direction. An electric…
Idea: Velocity Selector and Crossed Fields
MediumNumerical value - 9 Apr, Shift 2Q44A proton and a deutron (, u) having same kinetic energies enter a region of uniform magnetic field , moving…
Idea: Trajectory Radii Ratio for Same Kinetic Energy
EasySingle correct - 27 Jan, Shift 1Q42A proton moving with a constant velocity passes through a region of space without any change in its velocity. If and …
Idea: Velocity Selector and Crossed Fields
MediumOther - 31 Jan, Shift 1Q57An electron moves through a uniform magnetic field . At a particular instant of time, the velocity of…
Idea: Determinant Form of Magnetic Force
New ideaMediumNumerical value
JEE Main 20234 questions in 4 shifts
- 6 Apr, Shift 2Q57A proton with a kinetic energy of 2.0 eV moves into a region of uniform magnetic field of magnitude T. The…
Idea: Helical Motion and Pitch
MediumNumerical value - 8 Apr, Shift 1Q48A charge particle moving in magnetic field B, has the components of velocity along B as well as perpendicular to B. The path of the charge…
Idea: Helical Motion and Pitch
EasySingle correct - 11 Apr, Shift 2Q48An electron is allowed to move with constant velocity along the axis of current carrying straight solenoid. A. The electron will…
Idea: Helical Motion and Pitch
MediumOther - 13 Apr, Shift 2Q43An electron is moving along the positive x-axis. If the uniform magnetic field is applied parallel to the negative z-axis, then A. The…
Idea: Magnetic Force Direction Rules
New ideaEasyOther
JEE Main 202215 questions in 15 shifts
- 25 Jul, Shift 1Q41Two charged particles, having same kinetic energy, are allowed to pass through a uniform magnetic field perpendicular to the direction of…
Idea: Radius-Kinetic Energy Proportionality
New ideaMediumSingle correct - 25 Jul, Shift 2Q41An electron with energy 0.1 keV moves at right angle to the earth's magnetic field of Wbm. The frequency of…
Idea: Circular Motion in Uniform B-Field
Asked the year beforeMediumSingle correct - 26 Jul, Shift 1Q38A charge particle is moving in a uniform magnetic field T. If it has an acceleration of…
Idea: Magnetic Force Vector Calculation
Asked the year beforeEasySingle correct - 26 Jul, Shift 2Q47A velocity selector consists of electric field and magnetic field with . The value…
Idea: Velocity Selector and Crossed Fields
Asked the year beforeMediumSingle correct - 27 Jul, Shift 2Q43A cyclotron is used to accelerate protons. If the operating magnetic field is 1.0 T and the radius of the cyclotron 'dees' is 60 cm, the…
Idea: Cyclotron Frequency and Energy
Asked the year beforeEasySingle correct - 28 Jul, Shift 2Q12A triangular shaped wire carrying 10 A current is placed in a uniform magnetic field of 0.5 T, as shown in figure. The magnetic force on…
Idea: Magnetic Force Vector Calculation
Asked the year beforeEasySingle correct · figure - 29 Jul, Shift 2Q40An particle and a proton are accelerated from rest through the same potential difference. The ratio of linear momenta acquired by…
Idea: Radius-Accelerating Voltage Proportionality
New ideaEasySingle correct - 24 Jun, Shift 1Q32Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : In an uniform…
Idea: Work Done by Magnetic Force
Asked the year beforeEasyAssertion–reason - 24 Jun, Shift 2Q39A proton, a deuteron and an -particle with same kinetic energy enter into a uniform magnetic field at right angle to magnetic…
Idea: Trajectory Radii Ratio for Same Kinetic Energy
Asked the year beforeEasySingle correct - 26 Jun, Shift 1Q44A proton and an alpha particle of the same velocity enter in a uniform magnetic field which is acting perpendicular to their direction of…
Idea: Trajectory Radii Ratio for Same Velocity
New ideaEasySingle correct - 27 Jun, Shift 2Q58A deuteron and a proton moving with equal kinetic energy enter into to a uniform magnetic field at right angle to the field. If and…
Idea: Trajectory Radii Ratio for Same Kinetic Energy
Asked the year beforeEasyNumerical value - 28 Jun, Shift 1Q59A singly ionized magnesium atom (A=24) ion is accelerated to kinetic energy 5 keV, and is projected perpendicularly into a magnetic field…
Idea: Circular Motion in Uniform B-Field
Asked the year beforeMediumNumerical value - 29 Jun, Shift 1Q39A charge particle moves along circular path in a uniform magnetic field in a cyclotron. The kinetic energy of the charge particle…
Idea: Radius-Kinetic Energy Proportionality
New ideaEasySingle correct - 29 Jun, Shift 2Q44Given below are two statements : Statement I: The electric force changes the speed of the charged particle and hence changes its kinetic…
Idea: Work Done by Magnetic Force
Asked the year beforeEasyTwo statements - 30 Jun, Shift 1Q43A cyclotron is working at a frequency of 10 MHz. If the radius of its dees is 60 cm. The maximum kinetic energy of accelerated proton will…
Idea: Cyclotron Frequency and Energy
Asked the year beforeMediumSingle correct
JEE Main 20218 questions in 7 shifts
- 4 Aug, Shift 1Q9Assume there is a possibility of constant Electric field and Magnetic field and a charged particle under the influence of these forces…
Idea: Circular Motion in Uniform B-Field
Asked the year beforeEasySingle correct - 4 Aug, Shift 1Q28A potential difference of 800 V is applied across the plates of a parallel plate capacitor. The separation between the plates is 5 mm and…
Idea: Velocity Selector and Crossed Fields
New ideaEasyNumerical value - 26 Aug, Shift 2Q25If the maximum value of accelerating potential provided by a radio frequency oscillator is 12 kV. The number of revolution made by a…
Idea: Cyclotron Frequency and Energy
New ideaMediumNumerical value - 27 Aug, Shift 1Q13Two ions of masses 4 amu and 16 amu have charges e and e respectively. These ions pass through the region of constant…
Idea: Trajectory Radii Ratio for Same Kinetic Energy
New ideaMediumSingle correct - 25 Feb, Shift 1Q15A proton, a deuteron and an particle are moving with same momentum in a uniform magnetic field. The ratio of magnetic forces…
Idea: Magnetic Force Vector Calculation
Asked the year beforeMediumSingle correct - 25 Jul, Shift 2 · Q14Circular Motion in Uniform B-FieldAsked the year beforeEasy
- 16 Mar, Shift 2 · Q9Work Done by Magnetic ForceNew ideaEasy
- 18 Mar, Shift 2 · Q16Circular Motion in Uniform B-FieldAsked the year beforeMedium
JEE Main 20208 questions in 7 shifts
- 8 Jan, Shift 1 · Q12Magnetic Force Vector CalculationNew ideaMedium
- 9 Jan, Shift 1 · Q13Work-Energy Theorem in Combined E and B FieldsNew ideaHard
- 9 Jan, Shift 1 · Q14Lorentz Force Vector SummationNew ideaHard
- 9 Jan, Shift 2 · Q14Circular Motion in Uniform B-FieldNew ideaMedium
- 2 Sep, Shift 1 · Q13Helical Motion and PitchNew ideaMedium
- 2 Sep, Shift 2 · Q12Helical Motion and PitchNew ideaMedium
- 3 Sep, Shift 1 · Q2Magnetic Force Vector CalculationNew ideaEasy
- 3 Sep, Shift 2 · Q10Trajectory Radii Ratio for Same Accelerating PotentialNew ideaEasy
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.