Chapter 25: Electromagnetic Induction

10 Questions | Total Attempts: 1479

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Chapter 25: Electromagnetic Induction

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Questions and Answers
  • 1. 
    When there is a change in the magnetic field in a closed loop of wire
    • A. 

      a voltage is induced in the wire.

    • B. 

      A current is created in the loop of wire.

    • C. 

      Electromagnetic induction occurs.

    • D. 

      All of these

    • E. 

      None of these

  • 2. 
    Thrust a magnet into a coil of wire and the coil
    • A. 

      Becomes an electromagnet.

    • B. 

      Has a current in it.

    • C. 

      Both of these

    • D. 

      Neither of these

  • 3. 
    When a bar magnet is thrust into a coil of copper wire, the coil tends to
    • A. 

      Attract the magnet as it enters.

    • B. 

      Repel the magnet as it enters.

    • C. 

      Both of these

    • D. 

      Neither of these

  • 4. 
    Electromagnetic induction occurs in a coil when there is a change in
    • A. 

      Electric field intensity in the coil.

    • B. 

      Magnetic field intensity in the coil.

    • C. 

      Voltage in the coil.

    • D. 

      The coil's polarity.

    • E. 

      Electromagnetic polarity.

  • 5. 
    Voltage can be induced in a wire by
    • A. 

      Moving the wire near a magnet.

    • B. 

      Moving a magnet near the wire.

    • C. 

      Changing the current in a nearby wire.

    • D. 

      Choices A, B, and C are all true.

    • E. 

      None of the above choices are true.

  • 6. 
    A wire moving at right angles to a magnetic field has NO induced voltage
    • A. 

      If it is made of copper.

    • B. 

      If it is moving slowly.

    • C. 

      If it is moving very fast.

    • D. 

      If the wire is covered with insulation.

    • E. 

      None of the above choices are correct.

  • 7. 
    The magnetic field strength inside a current-carrying coil will be greater if the coil encloses a
    • A. 

      Vacuum.

    • B. 

      Wooden rod.

    • C. 

      Glass rod.

    • D. 

      Rod of iron.

    • E. 

      None of these

  • 8. 
    If a magnet is pushed into a coil, voltage is induced across the coil. If the same magnet is pushed into a coil with twice the number of loops
    • A. 

      One half as much voltage is induced.

    • B. 

      The same voltage is induced.

    • C. 

      Twice as much voltage is induced.

    • D. 

      Four times as much voltage is induced.

    • E. 

      None of these

  • 9. 
    An electric motor is very similar to
    • A. 

      An electric generator.

    • B. 

      An automobile battery.

    • C. 

      A radio receiver.

    • D. 

      None of the above choices are correct.

  • 10. 
    A device that transforms electrical energy to mechanical energy is a
    • A. 

      Generator.

    • B. 

      Motor.

    • C. 

      Transformer.

    • D. 

      Magnet.

    • E. 

      None of these

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