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Materials and Components problems

  • 1. For a diamagnetic material, ?r = 1.

  • Options
  • A. True
  • B. False
    • Discuss
  • 2. An electron for which l = 0 has zero orbital magnetic dipole moment.

  • Options
  • A. True
  • B. False
    • Discuss
  • 3. A magnetic field exists around

  • Options
  • A. moving charges
  • B. static charges
  • C. iron
  • D. copper
    • Discuss
  • 4. The resistance of a photoconductor

  • Options
  • A. increases with increase in light intensity
  • B. decreases with increase in light intensity
  • C. may increase or decrease with increase in light intensity
  • D. remains constant
    • Discuss
  • 5. The resistance of a metallic wire would

  • Options
  • A. increase as f increase
  • B. decrease as f increase
  • C. remains the same at all frequencies
  • D. increase with f up to a certain frequency and then decrease
    • Discuss
  • 6. Ferrimagnetic materials have anti-parallel orientation of equal moments of permanent dipoles.

  • Options
  • A. True
  • B. False
    • Discuss
  • 7. Consider the following materials

    1. Nickel
    2. Silver
    3. Oxygen
    4. Aluminium
    The correct sequence in the order of decreasing permeability is

  • Options
  • A. 1, 4, 3, 2
  • B. 1, 4, 2, 3
  • C. 4, 1, 3, 2
  • D. 4, 1, 2, 3
    • Discuss
  • 8. The mass of proton and electron are

  • Options
  • A. 1.672 x 10-26 kg and 9.107 x 10-31 kg respectively
  • B. 9.107 x 10-26 kg and 9.107 x 10-31 kg respectively
  • C. 9.107 x 10-29 kg and 9.107 x 10-31 kg respectively
  • D. 9.107 x 10-30 kg and 9.107 x 10-31 kg respectively
    • Discuss
  • 9. When an atom of polarizability a is placed in an electric field E, the energy stored in atom is 0.5 a E2.

  • Options
  • A. True
  • B. False
    • Discuss
  • 10. If ?0 is the angular frequency of rotation of electron in the absence of magnetic field, the angular frequency ?, when a magnetic field B is acting is ? ? ?0 + (e/2m)B.

  • Options
  • A. True
  • B. False
    • Discuss

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