Eddy current equation question

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Discussion Overview

The discussion revolves around the calculation of the repelling force generated by eddy currents when a magnet is moved against a conductive plate, such as copper. Participants explore the principles behind this phenomenon, including the roles of magnet strength, conductor properties, and relative motion.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant inquires about the possibility of calculating the repelling force of eddy currents, suggesting that factors such as magnet strength, conductor conductivity, and motion are key to the equation.
  • Another participant references Lenz's law and Faraday's law of mutual induction as relevant concepts for understanding the phenomenon.
  • A different participant expresses skepticism about the ability to calculate the resisting force, noting that the speed of the magnet affects the induced current and thus the repelling force. They share an observational experience with a cylindrical magnet and an aluminum tube, highlighting irregular motion and the influence of the metal's structure on electron flow.
  • This participant also suggests that holes in the metal can affect the flow of electrons, implying a circuit is created via induction.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the ability to calculate the repelling force of eddy currents, with some expressing uncertainty about the known parameters and others suggesting relevant laws and observations.

Contextual Notes

The discussion includes assumptions about the relationship between speed, induced current, and repelling force, but these relationships remain unresolved. The influence of the conductor's structure on the phenomenon is also noted but not fully explored.

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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:
 
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Anyone? Can someone please respond?
 
You should read about Lenz's law and Faraday's law of mutual induction
 
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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