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What happens to a permanent magnet inside a electromagnetic toroid?

  1. Aug 26, 2012 #1

    Miv

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    Suppose a permanent bar-magnet is placed inside a toroid/torus and the toroid is then completed and power applied. How will the magnet move? Will it move?
     
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  3. Aug 27, 2012 #2

    Simon Bridge

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    Welcome to PF;
    Have a think about this: how would the permanent magnet know to behave any differently to the toroid magnetic field as to any other magnetic field?
     
  4. Aug 28, 2012 #3

    Miv

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    So it would traverse the toroid and move to the side because of the difference in winding on the inner (center) and outer part of the toroid?
     
  5. Aug 28, 2012 #4

    Simon Bridge

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    Hmmm ... there are two possible "inside"s to a toroid :)

    You can use amphere's law to work out how the magnetic field varies in the plane of the toroid and see.
    http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/toroid.html

    At first glance I'd kinda expect a small magnet placed close to the center of a toroid to zip around in a circle. This motion would add a load to the circuit powering the toroid. If it went too fast it would hit the outer edge. You seem to have something on your mind.
     
    Last edited: Aug 28, 2012
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