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Old 10-07-2019, 06:04 PM
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ceptimus ceptimus is offline
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Join Date: Aug 2004
Location: UK
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Default Re: Drive by science

Yes. You can also see that the magnet is reluctant to move AWAY from the copper block when it's drawn back (the zoomed-out part of the video shows that best).

Whenever a magnet moves relative to a nearby conductor, eddy currents are induced in the conductor - and those eddy currents set up a magnetic field that opposes the magnet's movement.

If you've got superconductor so that the eddy currents can flow without resistance, you can levitate magnets over it - or levitate the superconductor over a magnet.


With a regular old copper block, the eddy currents do encounter resistance and quickly die away - so it behaves more like a shock absorber for the magnet than the 'perfect spring' behaviour of the superconductor.
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