Magnetic Properties of Materials: Diamagnetism, Paramagnetism and Ferromagnetism questions with solutions

Showing 1–10 of 55 questions

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

  A linear magnetic material has magnetic susceptibility χₘ=4×10⁻⁴. It is placed in a magnetising field H=5×10⁴ A m⁻¹. Its magnetisation I is:

  Options

  • Option A

    2 A m⁻¹

  • Option B

    20 A m⁻¹

  • Option C

    200 A m⁻¹

  • Option D

    2×10⁴ A m⁻¹

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

  Three samples are kept in the same weak external magnetic field: P is diamagnetic, Q is paramagnetic, and R is ferromagnetic below its Curie temperature. The temperature is increased considerably without a structural phase change. Which behaviour is most reasonable?

  Options

  • Option A

    Magnetism of all three changes equally strongly

  • Option B

    Diamagnetism is nearly temperature independent, while paramagnetism generally decreases with increasing temperature

  • Option C

    Paramagnetism increases according to χₘ∝T

  • Option D

    Diamagnetic susceptibility becomes large and positive

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

  Which microscopic property is primarily responsible for paramagnetism?

  Options

  • Option A

    All electrons are paired and each atom has zero permanent magnetic moment

  • Option B

    Atoms or molecules possess permanent magnetic moments due to unpaired electrons, but these moments are randomly oriented without an external field

  • Option C

    All atomic moments form permanent aligned domains even without interactions

  • Option D

    The applied field always induces a magnetic moment opposite to itself

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

  Individual atoms of a ferromagnetic material possess magnetic moments, but its extremely large magnetisation cannot be explained merely by the direct aligning action of an external field. The crucial microscopic mechanism is:

  Options

  • Option A

    Electrostatic shielding

  • Option B

    Quantum-mechanical exchange interaction favouring parallel alignment of neighbouring magnetic moments

  • Option C

    Induced diamagnetic currents only

  • Option D

    Gravitational interaction between atoms

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

  When an initially unmagnetised ferromagnetic specimen is placed in an increasing magnetic field, its magnetisation initially increases mainly because:

  Options

  • Option A

    Electrons are created inside the specimen

  • Option B

    Favourably oriented domains grow through domain-wall motion

  • Option C

    All atomic magnetic moments become zero

  • Option D

    Its susceptibility necessarily becomes negative

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

  An isolated atom of a substance has zero permanent magnetic dipole moment. When an external magnetic field is applied, its electronic orbital motion changes slightly and an induced magnetic moment appears opposite to the applied field. The substance is most likely:

  Options

  • Option A

    Paramagnetic

  • Option B

    Diamagnetic

  • Option C

    Ferromagnetic

  • Option D

    Ferrimagnetic

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

  For protecting sensitive equipment from an external magnetic field, which type of shielding arrangement should be used?

  Options

  • Option A

    Place the equipment inside an aluminium can.

  • Option B

    Place the equipment inside an iron can.

  • Option C

    Wrap the equipment with insulation carrying current.

  • Option D

    Surround the equipment with a fine copper sheet.

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  AIPMT 1998NEET Previous Year

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

  Let μ(d), μ(p) and μ(f) represent permanent atomic magnetic dipole moments of diamagnetic, paramagnetic and ferromagnetic materials, respectively. Which relation is correct?

  Options

  • Option A

    μ(d)=0; μ(p)≠0; μ(f)≠0

  • Option B

    μ(d)≠0; μ(p)=0; μ(f)≠0

  • Option C

    μ(d)≠0; μ(p)≠0; μ(f)=0

  • Option D

    μ(d)=μ(p)=μ(f)=0

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  AIPMT 2005NEET Previous Year

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

  A diamagnetic substance D and a paramagnetic substance P are separately introduced into the same non-uniform magnetic field. Which statement is correct?

  Options

  • Option A

    Both move toward the stronger-field region

  • Option B

    Both move toward the weaker-field region

  • Option C

    D tends toward the weaker-field region whereas P tends toward the stronger-field region

  • Option D

    D tends toward the stronger-field region whereas P tends toward the weaker-field region

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