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Arago's disk
# 5K20.42

Description: A bar magnet is suspended above an aluminum disk. When the disk starts spinning, it will 'drag' the magnet and cause it to start spinning in the same direction.

Purchased/Built: built

Setup Time: 1 hour

Quant. in Demo Room: 1

Demo References
Hilton E-8d.1 A magnet needle over a rotating copper disk.
The Video Encyclopedia of Physics Demonstrations Disc 20-25 A bar magnet suspended above a spinning aluminum disc will start to rotate.
Sutton E-226 A magnet suspended above a rotating horizontal copper disk will rotate.
The American Journal of Physics AJP 28(8),748 Support the horseshoe magnet by a bight with stranded string and "wind up" the string to get a high spin rate.

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