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Home ‣ Electronics ‣ Magnetism and Electromagnetism Comments
  • Question

  • 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

  • Correct Answer
  • d'Arsonval movement 

    • Magnetism and Electromagnetism problems

    Search Results

    • 1. 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
    • 2. 
      The movable part in a relay is the _____.

    • Options
    • A. plunger
    • B. armature
    • C. cone
    • D. brushes
      • Discuss
    • 3. 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
    • 4. 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
    • 5. Ferromagnetic materials have pre-existing magnetic fields.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. 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
    • 7. ___ 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
    • 8. 
      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
    • 9. You can determine the direction of the lines of force surrounding a conductor by using _____.

    • Options
    • A. the right-hand rule
    • B. the left-hand rule
    • C. Lenz's law
    • D. Faraday's law
      • Discuss
    • 10. The flux density is ___ when the magnetic flux is 9 µWb and the cross-sectional area of the magnetic field is 5 × 10?3 m2.

    • Options
    • A. 1800 µT
    • B. 555.56 T
    • C. 9 µT
    • D. 5 × 10?3 T
      • Discuss

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