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Field of a Circular Loop for JEE: 32 solved questions

Real JEE paper questions on field of a circular loop, part of moving charges and magnetism. Each opens with the options, the correct answer and a step-by-step solution. Papers run from 2002 to 2026. No sign-in needed to read them.

What this topic asks

• Centre and axis of a loop — 18 questions
• Rotating charges and multiple loops — 14 questions

All 32 questions with solutions

• A small cube of side 1 mm is placed at the centre of a circular loop of radius 10 cm carrying a current of 2… JEE Main 6th April 1st Shift 2026
• The magnetic field at the centre of a current carrying circular loop of radius R is 16 μT. The magnetic field… JEE Main 28th Jan 1st Shift 2026
• Let B₁ be the magnitude of magnetic field at the centre of a circular coil of radius R carrying current I. Le… JEE Main 2nd April 1st Shift 2025
• A circular loop of radius r is carrying current I A. The ratio of magnetic field at the centre of the circula… JEE Main 24th Jan 1st Shift 2023
• A single current carrying loop of wire carrying current I flowing in anticlockwise direction seen from +z dir… JEE Main 29th Jan 1st Shift 2023
• The electric current in a circular coil of four turns produces a magnetic induction 32 T at its centre. The c… JEE Main 29th Jan 2nd Shift 2023
• A long conducting wire having a current I flowing through it is bent into a circular coil of N turns. Then it… JEE Main 31st Jan 2nd Shift 2023
• The electric current in a circular coil of 2 turns produces a magnetic induction B₁ at its centre. The coil i… JEE Main 25th July 2nd Shift 2022
• B_X and B_Y are the magnetic fields at the centre of two coils X and Y respectively, each carrying equal curr… JEE Main 26th July 1st Shift 2022
• The magnetic field at the centre of a current carrying circular loop is B₁. The magnetic field at a distance… JEE Main 28th July 2nd Shift 2022
• The magnetic field at the centre of a circular coil of radius r, due to current I flowing through it, is B. T… JEE Main 24th June 1st Shift 2022
• The fractional change in the magnetic field intensity at a distance r from centre on the axis of current carr… JEE Main 26th Aug 1st Shift 2021
• Magnetic fields at two points on the axis of a circular coil at a distance of 0.05 m and 0.2 m from the centr… JEE Main 25th Feb 1st Shift 2021
• The magnetic field due to a current carrying circular loop of radius 3 cm at a point on the axis at a distanc… JEE Main 2004
• If in a circular coil A of radius R, current I is flowing and in another coil B of radius 2R a current 2I is… JEE Main 2002
• The ratio of magnetic field at the centre of a current carrying coil of radius r to the magnetic field at dis… JEE Main 8th April 2nd Shift 2023
• The dipole moment of a circular loop carrying a current I, is m and the magnetic field at the centre of the l… JEE Main 2018
• Two identical circular loops P and Q each of radius r are lying in parallel planes such that they have a comm… JEE Main 24th Jan 2nd Shift 2026
• Two insulated circular loops A and B of radius a carrying a current of I in the anti clockwise direction as s… JEE Main 30th Jan 1st Shift 2024
• A coil of n number of turns wound tightly in the form of a spiral with inner and outer radii r₁ and r₂ respec… JEE Main Online 2022
• A coil having N turns is wound tightly in the form of a spiral with inner and outer radii a and b respectivel… JEE Main 31st Aug 1st Shift 2021
• A thin ring of 10 cm radius carries a uniformly distributed charge. The ring rotates at a constant angular sp… JEE Main 12th April 1st Shift 2019
• One of the two identical conducting wires of length L is bent in the form of a circular loop and the other on… JEE Main 9th Jan 2nd Shift 2019
• A Helmholtz coil has a pair of loops, each with N turns and radius R. They are placed coaxially at distance R… JEE Main Online 2018
• Consider two thin identical conducting wires covered with very thin insulating material. One of the wires is… JEE Main Online 2014
• A charge Q is uniformly distributed over the surface of non-conducting disc of radius R. The disc rotates abo… JEE Main 2012
• Two concentric coils each of radius equal to 2π cm are placed at right angles to each other. 3 ampere and 4 a… JEE Main 2005
• A long wire carries a steady current. It is bent into a circle of one turn and the magnetic field at the cent… JEE Main 2004
• Two circular coils P and Q of 100 turns each have same radius of π cm. The currents in P and Q are 1 A and 2… JEE Main 31st Jan 2nd Shift 2024
• Two identical circular wires of radius 20 cm and carrying current √2 A are placed in perpendicular planes as… JEE Main 6th April 1st Shift 2023
• An electron in a hydrogen atom revolves around its nucleus with a speed of 6.76×10⁶ m s⁻¹ in an orbit of radi… JEE Main 15th April 1st Shift 2023
• A closely wounded circular coil of radius 5 cm produces a magnetic field of 37.68×10⁻⁴ T at its center. The c… JEE Main 29th July 1st Shift 2022