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Home ‣ Electronics ‣ Magnetism and Electromagnetism Comments
  • Question

  • Ferromagnetic materials have pre-existing magnetic fields.


  • Options
  • A. True
  • B. False

  • Correct Answer
  • False 

    • Magnetism and Electromagnetism problems

    Search Results

    • 1. 
      A magnetic field is produced around a current-carrying conductor.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. The ability of a material to maintain a magnetized state (without the presence of a magnetizing force) is called retentivity.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. The Hall voltage is the voltage created by a conductor moving through a magnetic field.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. The unit of magnetic flux density is the weber.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. A magnetic material such as iron can change the course of magnetic lines of force.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. The induced voltage across a stationary conductor in a stationary magnetic field ___.

    • Options
    • A. equals 0 V
    • B. is usually very large
    • C. varies with time
    • D. depends on the strength of the magnetic field
      • Discuss
    • 7. After the magnetizing force has been removed, the ratio of the remaining magnetic flux to the saturated magnetic flux is called _____________.

    • Options
    • A. saturation
    • B. retentivity
    • C. hysteresis
    • D. coercivity
      • Discuss
    • 8. 
      The movable part in a relay is the _____.

    • Options
    • A. plunger
    • B. armature
    • C. cone
    • D. brushes
      • Discuss
    • 9. A group of force lines going from the north pole to the south pole of a magnet is called the magnetic ___.

    • Options
    • A. retentivity
    • B. reluctance
    • C. hysteresis
    • D. flux
      • Discuss
    • 10. The ___ is an electromagnetic device that contains a coil rotating on a jeweled bearing mount.

    • Options
    • A. permanent-magnet speaker
    • B. d'Arsonval movement
    • C. single-pole, double-throw relay
    • D. crankshaft position sensor
      • Discuss

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