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Torque on a Current Loop and Magnetic Dipole Moment for JEE: 25 solved questions

Real JEE paper questions on torque on a current loop and magnetic dipole moment, part of moving charges and magnetism. Each opens with the options, the correct answer and a step-by-step solution. Papers run from 2011 to 2026. No sign-in needed to read them.

What this topic asks

• Magnetic moment of loops and charges — 13 questions
• Torque and potential energy — 12 questions

All 25 questions with solutions

• An insulated wire is wound so that it forms a flat coil with N=200 turns. The radius of the innermost turn is… JEE Main 4th April 1st Shift 2026
• In an electromagnetic system, a quantity defined as the ratio of electric dipole moment and magnetic dipole m… JEE Main 4th April 2nd Shift 2025
• Match List-I with List-II. List-I: (A) Permeability of free space, (B) Magnetic field, (C) Magnetic moment, (… JEE Main 23rd Jan 2nd Shift 2025
• The magnetic moments associated with two closely wound circular coils A and B of radius r_A = 10 cm and r_B =… JEE Main 30th Jan 1st Shift 2023
• Two concentric circular loops of radii r₁ = 30 cm and r₂ = 50 cm are placed in the X-Y plane as shown in the… JEE Main 26th July 2nd Shift 2022
• A wire carrying current I is bent in the shape ABCDEFA as shown, where rectangle ABCDA and ADEFA are perpendi… JEE Main 2nd Sept 2nd Shift 2020
• A charged particle going around in a circle can be considered to be a current loop. A particle of mass m carr… JEE Main 6th Sept 2nd Shift 2020
• A square loop is carrying a steady current I and the magnitude of its magnetic dipole moment is m. If this sq… JEE Main 10th April 2nd Shift 2019
• An insulating thin rod of length l has a linear charge density ρ(x) = ρ₀ x/l on it. The rod is rotated about… JEE Main 10th Jan 1st Shift 2019
• A charge q is spread uniformly over an insulated loop of radius r. If it is rotated with an angular velocity… JEE Main Online 2018
• A thin circular disk of radius R is uniformly charged with density σ > 0 per unit area. The disk rotates abou… JEE Main Re-Scheduled 2011
• A wire of length 314 cm carrying current of 14 A is bent to form a circle. The magnetic moment of the coil is… JEE Main 29th July 1st Shift 2022
• A uniform conducting wire of length 24a, and resistance R is wound up as a current carrying coil in the shape… JEE Main 27th Aug 1st Shift 2021
• A current carrying circular loop of radius 2 cm with unit normal n̂=(k̂+ı̂)/(√2) is placed in a magnetic fiel… JEE Main 8th April 2nd Shift 2026
• A magnetic dipole experiences a torque of 80√3 N m when placed in a uniform magnetic field in such a way that… JEE Main 3rd April 2nd Shift 2025
• A uniform magnetic field of 2×10⁻³ T acts along the positive Y-direction. A rectangular loop of sides 20 cm a… JEE Main 31st Jan 2nd Shift 2024
• A small circular loop of conducting wire has radius a and carries current I. It is placed in a uniform magnet… JEE Main 9th Jan 2nd Shift 2020
• A square loop of side 2a and carrying current I is kept in xz plane with its centre at origin. A long wire ca… JEE Main 6th Sept 2nd Shift 2020 (also JEE Main 5th Sept 1st Shift 2020)
• A circular coil having N turns and radius r carries a current I. It is held in the XZ plane in a magnetic fie… JEE Main 8th April 1st Shift 2019
• A rectangular coil (dimension 5 cm × 2.5 cm) with 100 turns, carrying a current of 3 A in the clockwise direc… JEE Main 9th April 1st Shift 2019
• A circular coil of radius 2 cm and 125 turns carries a current of 1 A. The coil is placed in a uniform magnet… JEE Main 4th April 2nd Shift 2026
• A circular coil having 200 turns, 2.5 × 10⁻⁴ m² area and carrying 100 μA current is placed in a uniform magne… JEE Main 6th April 1st Shift 2024
• A coil having 100 turns, area of 5 × 10⁻³ m², carrying current of 1 mA is placed in uniform magnetic field of… JEE Main 6th April 2nd Shift 2024
• A coil in the shape of an equilateral triangle of side 10 cm lies in a vertical plane between the pole pieces… JEE Main 26th Aug 1st Shift 2021
• A galvanometer coil has 500 turns and each turn has an average area 3 × 10⁻⁴ m². If a torque of 1.5 N m is re… JEE Main 3rd Sept 2nd Shift 2020