Magnetism and matter questions with solutions

Showing 1–10 of 73 questions

• MCQeasyMagnetism and mattermagnet in magnetic field, torque, potential energy, oscillation and magnetic moment

  A magnet oscillates in Earth's horizontal magnetic field $B_H$ with time period T. At the same place, a uniform horizontal external magnetic field of magnitude 3$B_H$ is applied parallel to Earth's field.

  The new time period is:

  Options

  • Option A

    T/2

  • Option B

    T/√3

  • Option C

    2T

  • Option D

    T/4

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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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• 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 mattermagnet in magnetic field, torque, potential energy, oscillation and magnetic moment

  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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• NumericmediumMagnetism and mattermagnet in magnetic field, torque, potential energy, oscillation and magnetic moment

  A short bar magnet placed with its axis at 30° with an external field of 800 Gauss, experiences a torque of 0.016 N·m. The work done in moving it from most stable to most unstable position is α × 10⁻³ J. The value of α is _______.

  Your answer

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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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• MCQdifficultMagnetism and matterproperties of magnetic substance

  A material intended for making a good permanent magnet should preferably possess:

  Options

  • Option A

    High retentivity and high coercivity

  • Option B

    Low retentivity and low coercivity

  • Option C

    High permeability but zero coercivity

  • Option D

    Negative magnetic susceptibility

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• MCQmediumMagnetism and matterproperties of magnetic substance

  A magnetic material obeys Curie-Weiss law χ=C/(T-$T_C).$ What is χ(2$T_C)/χ(3T_C)?$

  Options

  • Option A

    1/2

  • Option B

    1

  • Option C

    2

  • Option D

    3

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• MCQmediumMagnetism and matterpole stength ,magnetic moment and magnetic field due to magnet

  Two identical short bar magnets, each of magnetic moment M, have the same centre and mutually perpendicular magnetic axes. At a point P at distance r on the axial line of the first magnet, the magnitude of the resultant magnetic field is:

  Options

  • Option A

    (μ₀M/4πr³)√5

  • Option B

    (μ₀M/4πr³)√3

  • Option C

    3μ₀M/(4πr³)

  • Option D

    μ₀M/(2πr³)

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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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