Free physics question bank
pole stength ,magnetic moment and magnetic field due to magnet questions with solutions
Practice Magnetism and matter for JEE Main, JEE Advanced, NEET, and Classes 11–12. Attempt each question, then open it for the full solution.
Showing 1–10 of 15 questions
- MCQeasyMagnetism and matterOpen question & full solution →
A bar magnet of magnetic moment M is cut longitudinally into two identical magnets by a plane containing its magnetic axis. For each resulting magnet, pole strength m′ and magnetic moment M′ are:
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- MCQeasyMagnetism and matterOpen question & full solution →
A bar magnet has pole strength m, magnetic length 2l and magnetic moment M. It is cut into two equal pieces by a plane perpendicular to its magnetic axis. For each resulting magnet, pole strength m′ and magnetic moment M′ are:
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- MCQeasyMagnetism and matterOpen question & full solution →
Two identical short magnets, each of magnetic moment M, are placed with the same centre and their magnetic moments make an angle 120° with each other. The magnitude of their resultant magnetic moment is:
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- MCQeasyMagnetism and matter
A magnetic dipole experiences a torque of 80√3 N·m in a uniform magnetic field when its dipole moment makes an angle 60° with the field. The potential energy of the dipole is:
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JEE Mains 2025 3 April Evening Shift
Open question & full solution → - NumericmediumMagnetism and matter
The magnetic potential due to a magnetic dipole at a point on its axis situated at a distance of 20 cm from its center is 1.5 × 10⁻⁵ Tm. The magnetic moment of the dipole is__________ Am². (Given : μ₀/4π = 10⁻⁷ TmA⁻¹)
JEE Mains 2024 29 Jan Morning Shift
Open question & full solution → - MCQmediumMagnetism and matter
For the bar magnet geometry shown, d=10 units and half-length l=10 units. If percentage uncertainty in d is 1%, the percentage uncertainty in magnetic field at point P is:
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JEE Mains 2025 29 Jan Evening Shift
Open question & full solution → - MCQeasyMagnetism and matter
Assertion (A): Magnetic monopoles do not exist. Reason (R): Magnetic field lines are continuous and form closed loops. Choose the correct answer.
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JEE Mains 2025 7 April Evening Shift
Open question & full solution → - MCQmediumMagnetism and matterOpen question & full solution →
At a point P at distance r, a short bar magnet produces an axial magnetic field Bₐ. The point is then placed on the equatorial line at the same distance r, and simultaneously the magnetic moment of the magnet is doubled. The new magnetic field magnitude is:
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- MCQmediumMagnetism and matterOpen question & full solution →
A bar magnet of magnetic length 2l and pole strength m is bent at its centre so that its two equal halves make an angle 60° with each other. Pole strength remains unchanged. If its initial magnetic moment was M₀, the magnitude of the new magnetic moment is:
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- MCQmediumMagnetism and matterOpen question & full solution →
A short magnetic dipole of moment M is at the origin with its magnetic moment along +x. At a distant point, the position vector makes an angle θ with +x. If the magnetic field at that point is perpendicular to the magnetic moment, θ is:
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