Why do magnets degrade over time in terms of their strength? - Quora
Magnetism. Magnets What is a magnet? – An item that exhibits magnetism – What is magnetism? A property of matter in which there is a force of attraction. - ppt download
Do Rare Earth Magnets Lose Strength Over Time? | Stanford Magnets
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What Causes a Permanent Magnet to Lose Its Magnetism? | Sciencing