JEE Main · Physics · Dual Nature of Radiation and Matter
Photoelectrons in a Magnetic Field
JEE Main asked Photoelectrons in a Magnetic Field 2 times in 2 of the 108 shifts Lumi analysed, in 2020 and 2021. It belongs to Photoelectric Effect, in Dual Nature of Radiation and Matter (Physics). The longest wait between two years asking it was 1 year.
Updated 2026-10-24
- Times asked
- 2
- in 2 shifts
- Years
- 2 of 8
- First asked
- 2020
- last in 2021
- Pattern
- Gone quiet
- across the analysed shifts
Questions on this idea a shift, by year
2017–2026. Asked in 2020 and 2021. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Physics questions.
Raw count: 2017: 0 in 1 shift · 2020: 1 in 12 shifts · 2021: 1 in 24 shifts · 2022: 0 in 24 shifts · 2023: 0 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.
How JEE Main framed it
Numerical value is the usual form. Skill tested: multi-step.
- Magnetic field from photoelectron circular path
- Work function from photoelectron orbit radius
Difficulty
1 of the 2 questions had a numerical answer.
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.
- 25 Jul 2021, Shift 2 · Q26A light beam of wavelength 500 nm is incident on a metal having work function of 1.25 eV, placed in a magnetic field of intensity B. The…MediumNumerical value
- 9 Jan 2020, Shift 1 · Q18Radiation, with wavelength 6561 falls on a metal surface to produce photoelectrons. The electrons are made to enter a…MediumSingle correct
Shifts: 9 Jan 2020, Shift 1, 25 Jul 2021, Shift 2.
Same topic
Other ideas in Photoelectric Effect
Photoelectric Effect has 15 ideas JEE Main has asked; 13 of them came up in more than one question. The 12 most asked are below.
- Einstein's Photoelectric Equation14× · 2026
- Work Function and Threshold10× · 2025
- Two-Wavelength System of Equations7× · 2026
- Photon Flux and Beam Power7× · 2024
- Photon Energy and Momentum5× · 2026
- Stopping Potential4× · 2024
- Stopping Potential vs Frequency Graph4× · 2023
- Intensity vs Frequency Effects3× · 2024
- Comparative Graphs for Different Metals2× · 2026
- Solving via Two Wavelength Data Points2× · 2026
- Failure of Classical Wave Theory2× · 2024
- K_max versus Frequency Graph2× · 2024