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How does rotating a magnet affect the magnetic field?

  1. Aug 8, 2015 #1
    I'm doing an experiment on the effect of the speed of rotation of a rare earth magnet on the voltage generated in a solenoid coil. I was wondering, how does rotating the magnet affect the magnetic field?

    The experiment setup is similar to the one below:
  2. jcsd
  3. Aug 9, 2015 #2

    Jano L.

    User Avatar
    Gold Member

    The magnetic field pattern will rotate with the magnet, thus making the magnetic induction variable in time. From Faraday's law, we expect current to be induced in the coil. We explain this current as due to electric field. So we think of variable magnetic field to be necessarily accompanied with electric field.
  4. Aug 9, 2015 #3


    Staff: Mentor

    Your experiment sounds like a form of electric motor. Analyses of electric motor design should be adaptable to describe your experiment.
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