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In the levitating magnet demo, what was beneath the magnet? How does the disk turning change flux?

April 26, 2017beneath demo disk flux levitating magnet Turning

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In the levitating magnet demo, what was beneath the magnet? How does the disk turning change flux?

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See above… it’s an conducting aluminum disk beneath the magnet. (I think there’s a separating layer of plastic, probably just to stop the magnet flying off sideways).