What happens to a permanent magnet inside a electromagnetic toroid?

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Discussion Overview

The discussion revolves around the behavior of a permanent magnet placed inside an electromagnetic toroid when power is applied to the toroid. Participants explore the dynamics of the magnet's movement and the interaction with the magnetic field generated by the toroid.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant questions how the permanent magnet would behave differently in the toroidal magnetic field compared to any other magnetic field.
  • Another participant suggests that the magnet would move to the side due to differences in winding on the inner and outer parts of the toroid.
  • A different perspective introduces the idea that there are two possible "insides" to a toroid, implying complexity in the magnet's behavior.
  • One participant proposes using Ampère's law to analyze how the magnetic field varies within the toroid, indicating a potential method for understanding the magnet's motion.
  • Another participant speculates that a small magnet placed close to the center of the toroid might move in a circular path, potentially impacting the load on the circuit powering the toroid.

Areas of Agreement / Disagreement

Participants express differing views on the behavior of the magnet within the toroid, with no consensus reached on how it will move or the implications of its movement.

Contextual Notes

There are unresolved assumptions regarding the specific conditions under which the magnet is placed in the toroid, as well as the dependence on the definitions of "inside" in the context of a toroidal structure.

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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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?
 
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?
 
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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