Magic Magnet

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In this desktop gadget a small neodymium ring magnet mysteriously floats in the air, restrained by a piece of shoe lace. The trick is in a second magnet, hidden in the top beam. A single knot at both ends of the rope fixes the position of the ring magnet.

About the author:
Willem van Dreumel
Retired aerospace engineer. Author of many books on electronics and microprocessors.

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