Physics · JEE

Magnetic field due to a magnetic dipole (bar magnet) along its axis and perpendicular to its axis, torque on a magnetic dipole in a uniform magnetic field Concepts for JEE

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Concept explainer

Magnetic field due to a magnetic dipole (bar magnet) along its axis and perpendicular to its axis, torque on a magnetic dipole in a uniform magnetic field is a core JEE Main Physics subtopic under Magnetic Effects of Current and Magnetism. Master the definitions, standard results, and typical MCQ patterns tested in JEE Main and Advanced.

Key points

  • Understand the definition and scope of Magnetic field due to a magnetic dipole (bar magnet) along its axis and perpendicular to its axis, torque on a magnetic dipole in a uniform magnetic field in the JEE syllabus
  • Memorise key formulas and standard results linked to Magnetic field due to a magnetic dipole (bar magnet) along its axis and perpendicular to its axis, torque on a magnetic dipole in a uniform magnetic field
  • Practise 20–40 syllabus-aligned MCQs with step-by-step solutions

JEE tips

  • Revise Magnetic field due to a magnetic dipole (bar magnet) along its axis and perpendicular to its axis, torque on a magnetic dipole in a uniform magnetic field with a one-page formula sheet before attempting mixed tests
  • After each practice set, log mistakes specific to Magnetic field due to a magnetic dipole (bar magnet) along its axis and perpendicular to its axis, torque on a magnetic dipole in a uniform magnetic field and reattempt after 48 hours

Common trap

Students often rush Magnetic field due to a magnetic dipole (bar magnet) along its axis and perpendicular to its axis, torque on a magnetic dipole in a uniform magnetic field questions without checking units, sign conventions, or boundary conditions — always verify assumptions before calculating.

Free sample questions

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Q1PhysicsUnit 13: Magnetic Effects of Current and Magnetism
The force between two magnetic poles is FF when they are separated by certain distance. If the distance between the two poles is doubled and strength of each pole is tripled. The percentage change in the force between the two poles is :
Q2PhysicsUnit 13: Magnetic Effects of Current and Magnetism
The distance between two magnetic poles is doubled and their pole-strength is also doubled. The force between them
Q3PhysicsUnit 13: Magnetic Effects of Current and Magnetism
Assertion: The magnetic field lines of the earth resemble that of a magnetic dipole located at the centre of the earth. Reason: The axis of the dipole coincide with the axis of rotation of the earth.
Q4PhysicsUnit 13: Magnetic Effects of Current and Magnetism
Assertion (A) : The net magnetic flux coming out of a closed surface is always zero. Reason (R) : Unlike poles of equa strength exist together
Q5PhysicsUnit 13: Magnetic Effects of Current and Magnetism
In a plane perpendicular to the magnetic meridian the dip needle will remain :
Q6PhysicsUnit 13: Magnetic Effects of Current and Magnetism
A bar magnet of magnetic moment MM is divided into ' nn ' equal parts by cutting parallel to length. Then one part is suspended in a uniform magnetic field of strength 2T2 T and held making an angle 60060^{0} with the direction of the field. When the magnet is released, the kinetic energy of the magnet in the equilibrium position is:
Q7PhysicsUnit 13: Magnetic Effects of Current and Magnetism
A magnet makes 40 oscillations per minute at a place having magnetic field intensity of 0.1×1050.1 \times 10^{-5} T. At another place, it takes 2.5 seconds to complete one vibration. The value of earth's horizontal field at that place is
Q8PhysicsUnit 13: Magnetic Effects of Current and Magnetism
Two short magnets of equal dipole moments MM are fastened perpendicularly at their centres as given in the figure. The magnitude of the magnetic field at a distance dd from the centre on the bisector of the right angle is

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