Magnetism and Matter physics questions with solutions

Showing 1–10 of 19 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. An external horizontal field of magnitude 3$B_H/4$ is then applied opposite to Earth's horizontal field.

  The new time period is:

  Options

  • Option A

    2T

  • Option B

    T/2

  • Option C

    √2T

  • Option D

    4T

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

  A thin bar magnet of magnetic length L and original magnetic moment M is uniformly bent into a circular arc that subtends an angle φ at the centre, where φ is measured in radians.

  Its new magnetic moment is:

  Options

  • Option A

    M·2sin(φ/2)/φ

  • Option B

    M·sinφ/φ

  • Option C

    M·φ/[2sin(φ/2)]

  • Option D

    M cos(φ/2)

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

  A magnetic dipole of moment M and moment of inertia I is initially held at 120° to a uniform magnetic field B and released from rest. Neglect friction.

  Its maximum angular speed is:

  Options

  • Option A

    √(MB/I)

  • Option B

    √(2MB/I)

  • Option C

    √(3MB/I)

  • Option D

    2√(MB/I)

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

  A magnet of magnetic moment M and moment of inertia I oscillates with time period T in a uniform magnetic field B. It is replaced by another magnet having magnetic moment 4M and moment of inertia 9I.

  The time period of the new magnet is:

  Options

  • Option A

    3T/2

  • Option B

    3T/4

  • Option C

    2T/3

  • Option D

    3T

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

  A magnetic dipole of moment M is slowly rotated from its stable equilibrium orientation to its unstable equilibrium orientation in a uniform magnetic field B.

  The minimum external work required is:

  Options

  • Option A

    MB

  • Option B

    2MB

  • Option C

    MB/2

  • Option D

    4MB

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

  A magnetic dipole of moment M is rotated slowly in a uniform magnetic field B from θ=30° to θ=120°, where θ is the angle between $\vec{M}$ and $\vec{B}$.

  The increase in its magnetic potential energy is:

  Options

  • Option A

    (√3+1)MB/2

  • Option B

    (√3-1)MB/2

  • Option C

    MB/2

  • Option D

    √3MB

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

  A thin bar magnet has magnetic length L and magnetic moment M. It is bent uniformly into a semicircular arc without changing its pole strength.

  Its new magnetic moment is:

  Options

  • Option A

    M/π

  • Option B

    2M/π

  • Option C

    πM/2

  • Option D

    M/2

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

  A magnet performs small angular oscillations in a uniform magnetic field B with time period T. Its magnetic moment is doubled without changing its moment of inertia.

  The new time period is:

  Options

  • Option A

    T/2

  • Option B

    T/√2

  • Option C

    √2T

  • Option D

    2T

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