electromagnetism - How does a "permanent" magnet with switch work? - Physics Stack Exchange
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How Magnets Work | HowStuffWorks
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Attracted To A Better Way | Modern Machine Shop
Magnet Switch - Instructables
Magnet Switch - Instructables
Electropermanent magnet - Wikipedia
Is there any simple, low-energy way to make a permanent magnet able to turn 'on and off' (similar to an electromagnet)? - Quora
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Strong Hand Tools - Str-7089 , Heavy Duty, Adjust-O Magnet Square, On/Off Switches, Pull Force: 160 lbs, 6" x 5-1/8" x 1-3/8", MSA48-HD - Magnetic Sweepers - Amazon.com
How Magnets Work | HowStuffWorks
Magnets with an OFF Switch
How does a magnetic base work? - Wonkee Donkee Tools
