EMF Generated When Magnet Moves Linearly Across Its Field

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Discussion Overview

The discussion centers on whether an electromotive force (emf) is generated across a magnet when it moves linearly across its own magnetic field. The scope includes theoretical considerations of electromagnetic fields and frames of reference.

Discussion Character

  • Debate/contested

Main Points Raised

  • One participant questions if an emf is created between the faces of a rectangular magnet when it moves linearly across its own field.
  • Another participant argues that the magnet cannot move with respect to itself and suggests analyzing the situation from the magnet's rest frame, where no electric field exists.
  • A third participant references the phenomenon occurring in a rotating magnet, comparing it to the Faraday disc.
  • A later reply distinguishes between rotating and inertial frames, emphasizing that the discussion pertains to uniform linear motion of the magnet.

Areas of Agreement / Disagreement

Participants express differing views on the generation of emf in relation to the magnet's motion, indicating that multiple competing perspectives remain without consensus.

Contextual Notes

Participants have not resolved the implications of different frames of reference on the electric field and emf generation. The discussion lacks clarity on the definitions and assumptions regarding motion and electromagnetic fields.

Harsha Kumar
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Does an emf create across the body of a magnet when the magnet is linearly moving across its own field.

If ABCD is a rectangular magnet of thickness t, AB is the north pole and CD is the south pole. If the magnet moves in the direction of t, that is perpendicular to ABCD plane, will there be an emf generated between the faces AC and BD?
 
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You can't have the magnet move with respect to itself. If you are asking for the electric field on the faces of the magnet itself, then you can simply work in the rest frame of the magnet. In that frame, there is no electric field. In a Lorentz boosted frame, e.g. if I am standing still as the magnet moved passed me, then I will see an electric field.
 
Matterwave: But this is happening when a magnet rotates, like in the Faraday disc.
 
A rotating frame is different than a inertial frame. You are talking about a magnet undergoing uniform linear motion are you not?
 

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