barikáda Na jednodenný výlet dlho on of magnet lekársky viacúčelový najväčším
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Electropermanent magnet - Wikipedia
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Magnetic field
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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Electropermanent magnet - Wikipedia
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Magnets and Their Fields - Magnet City
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