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Eddy current equation question

  1. Aug 26, 2006 #1
    Whenever you stroke a magnet against a plate of copper or another good conductor of electricity you always get a force that opposes the movement of a magnet called and eddy current. What i want to know is can you calculate the repeling force of the eddy current? and if so how? I know that the key to the equation must have something to do with the strength of a magnet, how well the conductor conducts and the relative motion of the magnet or copper plate.

    Thanks!!:biggrin:
     
  2. jcsd
  3. Aug 27, 2006 #2
    Anyone? Can someone please respond?
     
  4. Sep 3, 2006 #3
    You should read about Lenz's law and Faraday's law of mutual induction
     
  5. Sep 4, 2006 #4
    i do not believe that much is known about calculating the resisting force. The faster is moves the more it induces a current which repels it more. I remember observing a good experiment a cylindrical magnet perfectly sized for an aluminium tube, it moved somewhat irregularily, sometimes it went a bit faster and other times a bit slower. But it took 10 times longer to pass through than a regular non-magnet of equivalent shape.
    The structure of the metal is also important in the effect, hole in the metal will effect the flow of the electrons. in essense it creates a circuit via induction. If you want to learn more i suggest you take electromagnetism
     
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