What happens to a permanent magnet inside a electromagnetic toroid?

  • Thread starter Miv
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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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  • #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?
 
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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?
 
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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.
 
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