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Moving a manget towards a superconductive coil

Physics Asked by George Kourtis on March 17, 2021

When we move a magnet towards a coil, the variation of magnetic flux induces an electric field that may generate a current in the coil. The current generated creates a magnetic field that has a direction counteracting the variation due to the flux variation and counteracting thus to the magnet movement.

If the coil has a a very low resistance, then the current generated could be so high that could generate so huge counteracting field that would be higher than the variation induced by the moving magnet, but in that case the effect would self destroy itself as the next step would be to create an opposite current than before.

So it seems that the only possibility is to have a current so high as needed in order to nullify the variation due to the movement of the magnet.

Is that correct and what are the details of it ?

More over, moving at a high acceleration the magnet towards the coil and stopping it when we have "touched" the surface of the coil, retracting it slowly back and reaccelerating it towards the coil we can "charge" the coil with energy continously supposing that the coil has zero resistance ( as the energy of the coil is E=L*I^2/2 ). This is like a spinning top with push button having a spiral.

Is that correct ?

I found after words the following video that should be in line with what described "Quantum Locking Will Blow Your Mind—How Does it Work?"

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