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Home ‣ Electronics ‣ Magnetism and Electromagnetism Comments
  • Question

  • 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

  • Correct Answer
  • True 

    • Magnetism and Electromagnetism problems

    Search Results

    • 1. The Hall voltage is the voltage created by a conductor moving through a magnetic field.

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

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

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. The magnetic field, current through the Hall element, and Hall voltage are all at right angles to each other.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. The induced emf of a conductor cutting flux lines is directly proportional to the rate of cutting.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. 
      A magnetic field is produced around a current-carrying conductor.

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

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. 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
    • 9. 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
    • 10. 
      The movable part in a relay is the _____.

    • Options
    • A. plunger
    • B. armature
    • C. cone
    • D. brushes
      • Discuss

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