Magnetic Properties physics questions with solutions

Showing 1–10 of 20 questions

• 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

  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

  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 matterproperties of magnetic substance

  A substance has magnetic susceptibility χₘ=-2.5×10⁻⁵. Which statement is correct?

  Options

  • Option A

    μᵣ=1.000025 and the substance is paramagnetic

  • Option B

    μᵣ=0.999975 and the substance is diamagnetic

  • Option C

    μᵣ=-2.5×10⁻⁵ and the substance is diamagnetic

  • Option D

    μᵣ=1 and the substance is non-magnetic

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• MCQeasyMagnetism and matterproperties of magnetic substance

  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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• MCQeasyMagnetism and matterproperties of magnetic substance

  A paramagnetic specimen has magnetic susceptibility χₘ=6×10⁻⁴. It is placed in a magnetising field H=2×10⁵ A m⁻¹. Its magnetisation I is:

  Options

  • Option A

    12 A m⁻¹

  • Option B

    120 A m⁻¹

  • Option C

    1.2×10³ A m⁻¹

  • Option D

    3.33×10⁸ A m⁻¹

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• MCQdifficultMagnetism and matterproperties of magnetic substance

  The area enclosed by the B-H hysteresis loop of a ferromagnetic material represents:

  Options

  • Option A

    Magnetic susceptibility

  • Option B

    Magnetic energy dissipated per unit volume in one complete cycle of magnetisation

  • Option C

    Magnetic moment per atom

  • Option D

    Saturation magnetisation

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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

  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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