JEE Main · Physics · Moving Charges and Magnetism
Field at Center of Regular Polygon
JEE Main asked Field at Center of Regular Polygon 5 times in 5 of the 108 shifts Lumi analysed, in 2020, 2021, 2024 and 2025. It belongs to Biot-Savart Law, in Moving Charges and Magnetism (Physics). The longest wait between two years asking it was 3 years. In 2024 it came in more than one shift of the same year.
Updated 2026-10-24
- Times asked
- 5
- in 5 shifts
- Years
- 4 of 8
- First asked
- 2020
- last in 2025
- Pattern
- Comes in cycles
- across the analysed shifts
Questions on this idea a shift, by year
2017–2026. Asked in 2020, 2021, 2024 and 2025. 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: 2 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.
How JEE Main framed it
Numerical value is the usual form. Skill tested: calculation.
- Field at centre of loop with split current
- Field at centre of square loop
Difficulty
2 of the 5 questions had a numerical answer.
Every question
All 5 questions
From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.
- 8 Apr 2025, Shift 2 · Q39Figure shows a current carrying square loop ABCD of edge length is 'a' lying in a plane. If the resistance of the ABC part is r and that…HardDiagram basedHas a figure
- 30 Jan 2024, Shift 2 · Q57The current of 5A flows in a square loop of sides is placed in air. The magnetic field at the centre of the loop is…EasyNumerical value
- 1 Feb 2024, Shift 1 · Q57A regular polygon of 6 sides is formed by bending a wire of length meter. If an electric current of A is flowing…MediumNumerical value
- 31 Aug 2021, Shift 2 · Q17A current of 1.5 A is flowing through a triangle, of side 9 cm each. The magnetic field at the centroid of the triangle is : (Assume that…MediumSingle correct
- 3 Sep 2020, Shift 1 · Q13Magnitude of magnetic field (in SI units) at the centre of a hexagonal shape coil of side 10 cm, 50 turns and carrying current I (Ampere)…MediumSingle correct
Shifts: 3 Sep 2020, Shift 1, 31 Aug 2021, Shift 2, 30 Jan 2024, Shift 2, 1 Feb 2024, Shift 1, 8 Apr 2025, Shift 2.
Same topic
Other ideas in Biot-Savart Law
Biot-Savart Law has 11 ideas JEE Main has asked; 9 of them came up in more than one question.
- Field at center of circular arc8× · 2025
- Superposition of magnetic fields5× · 2026
- Ratio of Axial to Central Magnetic Field5× · 2025
- Field of an N-Turn Flat Coil4× · 2026
- Infinite and semi-infinite wires4× · 2024
- Dimensions of Permeability3× · 2025
- Field on axis of circular loop2× · 2023
- Field at Center of Spiral Coil2× · 2022
- Vector form of Biot-Savart Lawonce · 2024
- Field of a Hairpin Looponce · 2021