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MHT-CET Magnetic Materials — practice questions

Explore 38 free Magnetic Materials questions in MHT-CET Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Magnetic Materials questions and exercises with answers

Showing questions 1–30 of 38.

A bar magnet in a uniform field has minimum potential energy when the angle between m and B isRead the answer and worked solution →The potential energy of a magnetic dipole is maximum when it is placedRead the answer and worked solution →A magnet of moment 3 A m^2 is at 30 degrees to a 0.4 T field. What torque acts on it?Read the answer and worked solution →The time period of small oscillations of a magnet of moment of inertia I in field B isRead the answer and worked solution →If the moment of inertia of an oscillating magnet is made four times, its time period becomesRead the answer and worked solution →A vibration magnetometer compares magnetic fields because a disturbed suspended magnetRead the answer and worked solution →In a magnet oscillating at constant I and m, quadrupling B changes the time period by a factor ofRead the answer and worked solution →An electron orbiting a nucleus is equivalent toRead the answer and worked solution →The orbital magnetic moment of an orbiting electron equalsRead the answer and worked solution →The value of the Bohr magneton is aboutRead the answer and worked solution →The gyromagnetic ratio of an electron, e/2m, is about (e = 1.6 x 10^-19 C, m = 9.1 x 10^-31 kg)Read the answer and worked solution →The SI unit of both magnetic intensity H and magnetization M isRead the answer and worked solution →The relation between magnetization M, intensity H and susceptibility χ isRead the answer and worked solution →For a perfect superconductor the magnetic susceptibility isRead the answer and worked solution →If χ = -1, the magnetic permeability of the material isRead the answer and worked solution →Relative permeability μr of a material is related to susceptibility χ byRead the answer and worked solution →A toroid is filled with aluminium of susceptibility 2.3 x 10^-5. The field rises by aboutRead the answer and worked solution →The susceptibility of a diamagnetic material isRead the answer and worked solution →Which kind of material has a very large positive susceptibility?Read the answer and worked solution →A diamagnetic substance in a non-uniform field tends to moveRead the answer and worked solution →Which of these is a diamagnetic material?Read the answer and worked solution →Atoms with completely filled electron orbits behave asRead the answer and worked solution →A freely suspended rod of diamagnetic material in a field aligns itselfRead the answer and worked solution →Perfect diamagnetism with complete expulsion of field lines from a superconductor is calledRead the answer and worked solution →A diamagnetic liquid in a U tube has one arm in a strong field. The liquid level in that armRead the answer and worked solution →Paramagnetic atoms have a net dipole moment because they containRead the answer and worked solution →Magnetization of a paramagnetic material rises withRead the answer and worked solution →Curie's law says the magnetization of a paramagnet isRead the answer and worked solution →Which group lists only ferromagnetic metals?Read the answer and worked solution →The strong interaction between neighbouring atomic moments in a ferromagnet is calledRead the answer and worked solution →

Worked practice questions

A bar magnet in a uniform field has minimum potential energy when the angle between m and B is

  1. 45 degrees
  2. 90 degrees
  3. 180 degrees
  4. 0 degrees
Show answer and solution

Correct answer: D. 0 degrees

U = -mB cos(theta) is lowest, equal to -mB, when theta is zero and the magnet is most stable.

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The potential energy of a magnetic dipole is maximum when it is placed

  1. perpendicular to the field
  2. at 45 degrees to the field
  3. parallel to the field
  4. antiparallel to the field
Show answer and solution

Correct answer: D. antiparallel to the field

At 180 degrees U = +mB, the highest value, so this orientation is the most unstable.

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A magnet of moment 3 A m^2 is at 30 degrees to a 0.4 T field. What torque acts on it?

  1. 1.2 N m
  2. 0.6 N m
  3. 0.3 N m
  4. 1.04 N m
Show answer and solution

Correct answer: B. 0.6 N m

Torque = mB sin30 = 3 x 0.4 x 0.5 = 0.6 N m.

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More Physics topics

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