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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- IntegermediumMagnetism and matter
Two identical small bar magnets, each having magnetic dipole moment 3√5 J·T⁻¹, are placed with their axes perpendicular to each other as shown in the figure. Their centre-to-centre separation is 10 cm, and point P is midway between them. Taking μ₀ = 4π×10⁻⁷ T·m·A⁻¹, if the net magnetic field at P is α×10⁻³ T, find α.
JEE Mains 2026 4 April Evening Shift
Open question & full solution → - 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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- MCQmediumMagnetism and matterOpen question & full solution →
A short magnetic dipole of moment M is placed at the origin with its magnetic moment along the x-axis. Point P has coordinates (a,a), where a is much larger than the size of the magnet. The magnetic field magnitude at P is:
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- 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 →
Two identical short bar magnets, each of magnetic moment M, have the same centre and mutually perpendicular magnetic axes. At a point P at distance r on the axial line of the first magnet, the magnitude of the resultant magnetic field is:
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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 → - MCQdifficultMagnetism and matterOpen question & full solution →
Two short bar magnets of magnetic moments M and 2M have their centres on the same straight line, separated by distance d. Their magnetic moments are parallel to this line and point in the same direction. A neutral point lies between them. Its distance x from the magnet of moment M 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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