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magnetics - Magnet that needs power to turn off? Inverse coil? - Electrical Engineering Stack Exchange
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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Magnetpro Multipurpose Switch Magnet, Magnet System with 300 kg Extraction Force, On/Off Magnet for Lifting, Working & Welding Positioning, Liquid Filtration, Automation, Metal Separation : Amazon.co.uk: Business, Industry & Science
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