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Home ‣ Electrical Engineering ‣ Magnetism and Electromagnetism Comments
  • Question

  • Materials with a low retentivity do not retain a magnetic field very well.


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  • A. True
  • B. False

  • Correct Answer
  • True 

    • Magnetism and Electromagnetism problems

    Search Results

    • 1. The tesla is the unit of magnetic flux.

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    • A. True
    • B. False
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    • 2. Ampere-turn is the unit of magnetomotive force (mmf).

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    • A. True
    • B. False
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    • 3. If a conductor is moved back and forth at a constant rate in a constant magnetic field, the voltage in the conductor will reverse polarity.

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    • A. True
    • B. False
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    • 4. A relay is an electromagnetically controlled mechanical device in which electrical contacts are opened or closed by a magnetizing current.

    • Options
    • A. True
    • B. False
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    • 5. The Thevenin equivalent voltage (VTH) is the short-circuit voltage between two terminals in a circuit.

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    • A. True
    • B. False
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    • 6. Hysteresis is the number of lines of force per unit area in a magnetic field.

    • Options
    • A. True
    • B. False
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    • 7. Lenz's law defines the polarity of the induced voltage.

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    • A. True
    • B. False
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    • 8. A magnetic field is made up of flux lines.

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    • A. True
    • B. False
      • Discuss
    • 9. Reluctance in a magnetic circuit is analogous to current in an electrical circuit.

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    • A. True
    • B. False
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    • 10. Electromagnetic induction is the force that produces a magnetic field.

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    • A. True
    • B. False
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