Magnetic Properties physics questions with solutions

Showing 1–10 of 20 questions

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

  Two linear magnetic materials A and B are placed in the same magnetising field H. Their susceptibilities are χ_A=+4×10⁻⁴ and χ_B=-2×10⁻⁴. The ratio of their magnetisations $I_A/I_B$ is:

  Options

  • Option A

    2

  • Option B

    -2

  • Option C

    -1/2

  • Option D

    1/2

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

  A paramagnetic substance obeys Curie's law. Its magnetic susceptibility is χ₁ at 27°C. What is its susceptibility at 127°C?

  Options

  • Option A

    3χ₁/4

  • Option B

    4χ₁/3

  • Option C

    27χ₁/127

  • Option D

    χ₁/2

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

  Consider the following statements: I. Diamagnetism arises from an induced magnetic moment opposite to the applied field. II. Paramagnetic atoms generally possess permanent magnetic moments, but thermal agitation tends to randomise them. III. Ferromagnetism involves cooperative alignment associated with exchange interaction and magnetic domains. IV. Above the Curie temperature, a ferromagnet generally loses spontaneous ferromagnetic ordering. Which option is correct?

  Options

  • Option A

    I and II only

  • Option B

    II and III only

  • Option C

    I, II and III only

  • Option D

    I, II, III and IV

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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

  An unmagnetised piece of a ferromagnetic material may contain many strongly magnetised microscopic domains, yet its net magnetic moment can be nearly zero because:

  Options

  • Option A

    Each domain individually has zero magnetic moment

  • Option B

    Different domains are oriented so that their vector sum is approximately zero

  • Option C

    The material becomes diamagnetic whenever it is unmagnetised

  • Option D

    Electron spins disappear in the absence of an external field

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

  A ferromagnetic specimen reaches magnetic saturation at a sufficiently large magnetising field. Further increase in H then produces relatively little additional magnetisation because:

  Options

  • Option A

    All magnetic domains have disappeared

  • Option B

    Nearly all available domain or atomic magnetic moments are already aligned with the field

  • Option C

    The material has become diamagnetic

  • Option D

    The Curie temperature has necessarily been reached

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

  A paramagnetic material generally shows only weak magnetisation even though its atoms possess permanent magnetic dipole moments. The principal reason is:

  Options

  • Option A

    Atomic magnetic moments vanish in a magnetic field

  • Option B

    Thermal agitation tends to randomise the atomic magnetic moments

  • Option C

    Its magnetic susceptibility is always negative

  • Option D

    Orbital motion of every electron stops

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

  For the core of a transformer operating under repeated alternating magnetisation, the preferred magnetic material should have:

  Options

  • Option A

    Large coercivity and a large hysteresis-loop area

  • Option B

    Small coercivity, high permeability and a small hysteresis-loop area

  • Option C

    Large retentivity and very large coercivity

  • Option D

    Negative magnetic susceptibility

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

  Above its Curie temperature, a ferromagnetic material approximately obeys the Curie-Weiss law χ=C/(T-$T_C).$ If T₁=2$T_C$ and T₂=4$T_C,$ then χ(T₁)/χ(T₂) is:

  Options

  • Option A

    1/3

  • Option B

    1

  • Option C

    3

  • Option D

    4

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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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