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Moving the magnetic field around a fixed conductor?

Physics Asked by Pupil on December 15, 2020

In this example:

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and many others related to electromagnetic induction, the main component of motion would be the conductor perpendicular to a magnetic field.

I know it’s possible to have it the other way around, fixed conductor and move the magnetic field source (e.g., magnets, electromagnets), but I’m curious of the type of force the magnetic field source would experience when current flows.

In a typical generator (where the wire rotates around a fixed magnet(s)) there is an induced EMF ($vBL$) and current will flow to the load, and due to the induced EMF is opposing the change in magnetic field flux, the Lorentz force acting on the wire will oppose the applied motion ($v$). What about the case when the magnet rotates a fixed conductor? Will it experience an induced Lorentz force opposing the motion?

One Answer

Yes, induced electric field around the magnet will produce current in the static conductor, energy will get dissipated in it and kinetic energy of the magnet will decrease.

Answered by Ján Lalinský on December 15, 2020

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