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5 questions
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  • Q1
    electric current passing through a wire produces
    geographic poles
    a permanent magnet
    a compass
    a magnetic field around the wire
    30s
  • Q2
    which of the following best describes an electromagnet
    permanent magnet
    insensitive to electric currents
    unchanging magnetic properties
    temporary magnet
    30s
  • Q3
    what effect does increasing the current in the wire have on an electromagnet?
    it causes it to become a permanent magnet
    it has no effect on the electromagnet
    it decreases the strength of the magnetic field
    it increases the strength of the magnetic field
    30s
  • Q4
    which of the following changes electrical energy into mechanical energy?
    transformerr
    superconductor
    generator
    electric motor
    30s
  • Q5
    in order for the electromagnetic coil in the motor to keep turning, the current must _____.
    continue in one direction
    be through an ammeter
    change direction
    periodically increase in strength
    30s

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