Magnetism and matter questions with solutions

Showing 1–10 of 106 questions

• MCQmediumMagnetism and matterMagnetic Pole Strength, Magnetic Dipole Moment and Magnetic Field Due to a Bar Magnet

  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:

  

  Options

  • Option A

    2%

  • Option B

    3%

  • Option C

    1.5%

  • Option D

    0.5%

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• MCQmediumMagnetism and matterMagnetic Dipole in a Uniform Magnetic Field: Torque, Potential Energy and Oscillations

  A magnet of magnetic moment M and moment of inertia I oscillates with time period T in a uniform magnetic field B. It is replaced by another magnet having magnetic moment 4M and moment of inertia 9I.

  The time period of the new magnet is:

  Options

  • Option A

    3T/2

  • Option B

    3T/4

  • Option C

    2T/3

  • Option D

    3T

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• MCQdifficultMagnetism and matterMagnetic Properties of Materials: Diamagnetism, Paramagnetism and Ferromagnetism

  A ferromagnetic material is heated above its Curie temperature $T_C.$ In the absence of another phase transition, it generally behaves as:

  Options

  • Option A

    A perfect diamagnet

  • Option B

    A paramagnet

  • Option C

    An ideal permanent magnet with increased magnetisation

  • Option D

    A superconductor

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• MCQdifficultMagnetism and matterMagnetic Dipole in a Uniform Magnetic Field: Torque, Potential Energy and Oscillations

  A thin magnet has small-oscillation time period T in a uniform magnetic field. It is bent sharply at its midpoint so that the magnetic-moment vectors of its two equal halves make an angle 120° with each other. Assume its moment of inertia about the suspension axis remains unchanged.

  The new time period is:

  Options

  • Option A

    T

  • Option B

    √2T

  • Option C

    2T

  • Option D

    T/√2

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• MCQeasyMagnetism and matterMagnetic Dipole in a Uniform Magnetic Field: Torque, Potential Energy and Oscillations

  A magnetic dipole of moment M is placed exactly antiparallel to a uniform magnetic field B.

  Which statement is correct?

  Options

  • Option A

    It is in stable equilibrium

  • Option B

    It is in unstable equilibrium

  • Option C

    The torque is maximum

  • Option D

    Its potential energy is minimum

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• MCQeasyMagnetism and matterMagnetic Dipole in a Uniform Magnetic Field: Torque, Potential Energy and Oscillations

  A bar magnet of magnetic moment M and moment of inertia I is suspended freely in a uniform horizontal magnetic field B. It is displaced through a small angle from its stable equilibrium position and released.

  Its time period of small angular oscillations is:

  Options

  • Option A

    2π√(I/MB)

  • Option B

    2π√(MB/I)

  • Option C

    π√(I/MB)

  • Option D

    2π√(I/2MB)

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• MCQeasyMagnetism and matterMagnetic Pole Strength, Magnetic Dipole Moment and Magnetic Field Due to a Bar Magnet

  A bar magnet of magnetic moment M is placed at right angles to a magnetic field B. If each pole experiences force F, what is the magnet length?

  Options

  • Option A

    MB/F

  • Option B

    BF/M

  • Option C

    MF/B

  • Option D

    F/(MB)

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• IntegereasyMagnetism and matterMagnetic Properties of Materials: Diamagnetism, Paramagnetism and Ferromagnetism

  A solenoid of length 15 cm has 60 turns. Find the current required to produce a magnetic field intensity H = 2.4 × 10³ A m⁻¹ for demagnetizing a bar magnet.

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• MCQmediumMagnetism and matterMagnetic Dipole in a Uniform Magnetic Field: Torque, Potential Energy and Oscillations

  A bar magnet of magnetic moment 2 × 10⁴ J T⁻¹ can rotate freely in a horizontal plane. A horizontal magnetic field B = 6 × 10⁻⁴ T is applied. Calculate the work required to rotate the magnet from parallel to the field to 60° from the field.

  Options

  • Option A

    0.6 J

  • Option B

    1.2 J

  • Option C

    6 J

  • Option D

    2 J

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• MCQeasyMagnetism and matterMagnetic Properties of Materials: Diamagnetism, Paramagnetism and Ferromagnetism

  Curie temperature is the temperature above which:

  Options

  • Option A

    ferromagnetic material becomes paramagnetic materi

  • Option B

    paramagnetic material becomes diamagnetic materia

  • Option C

    paramagnetic material becomes ferromagnetic materi

  • Option D

    ferromagnetic material become diamagnetic materi

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