Magnetic Properties physics questions with solutions

Showing 1–10 of 20 questions

• MCQdifficultMagnetism and matterproperties of magnetic substance

  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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• MCQmediumMagnetism and matterproperties of magnetic substance

  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 matterproperties of magnetic substance

  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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• MCQdifficultMagnetism and matterproperties of magnetic substance

  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 matterproperties of magnetic substance

  An atom has completely filled electronic shells. Which statement best explains why its permanent magnetic moment is generally zero?

  Options

  • Option A

    Each electron has zero spin

  • Option B

    Orbital and spin magnetic moments of paired electrons cancel

  • Option C

    The nucleus prevents magnetic moment formation

  • Option D

    Its magnetic susceptibility must therefore be exactly zero

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• MCQeasyMagnetism and matterproperties of magnetic substance

  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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• MCQdifficultMagnetism and matterproperties of magnetic substance

  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 matterproperties of magnetic substance

  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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• MCQeasyMagnetism and matterproperties of magnetic substance

  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 matterproperties of magnetic substance

  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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