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Magnetism and Electromagnetism problems

  • 1. Electronics Magnetism and Electromagnetism: A magnetic field i
    A magnetic field is produced around a current-carrying conductor.

  • Options
  • A. True
  • B. False
    • Discuss
  • 2. Ferromagnetic materials have pre-existing magnetic fields.

  • Options
  • A. True
  • B. False
    • Discuss
  • 3. 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
  • 4. 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
  • 5. Electronics Magnetism and Electromagnetism: The movable part i
    The movable part in a relay is the _____.

  • Options
  • A. plunger
  • B. armature
  • C. cone
  • D. brushes
    • Discuss
  • 6. 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
  • 7. 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
  • 8. When the speed at which a conductor is moved through a magnetic field is increased, the induced voltage will _____.

  • Options
  • A. not be affected
  • B. equal 0 V
  • C. decrease
  • D. increase


    • Discuss
  • 9. ___ is the ability of a material to remain magnetized after removal of the magnetizing force.

  • Options
  • A. Reluctance
  • B. Hysteresis
  • C. Retentivity
  • D. Induction
    • Discuss
  • 10. Electronics Magnetism and Electromagnetism: When the current t
    When the current through a coil reverses direction, the magnetic field around the coil _____.

  • Options
  • A. does not change
  • B. disappears
  • C. increases in strength
  • D. reverses direction
    • Discuss

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