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  • Question

  • 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

  • Correct Answer
  • increase as f increase 

    Explanation
    As increases the resistance increases due to skin effect.

    Materials and Components problems

    Search Results

    • 1. 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
    • 2. A magnetic field exists around

    • Options
    • A. moving charges
    • B. static charges
    • C. iron
    • D. copper
      • Discuss
    • 3. An electron for which l = 0 has zero orbital magnetic dipole moment.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. For a diamagnetic material, ?r = 1.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. Yettrium-iron garnet (Y2Fe5O12) is a soft magnetic material suitable for applications involving

    • Options
    • A. dc
    • B. 50 Hz ac
    • C. ac of a few K Hz
    • D. ac of a few hundred MHz
      • 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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