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Neodymium magnets are a type of rare earth magnet. Composed of boron, iron and neodymium, these magnets are the strongest-known magnets. They are used mostly in industry, in applications such as computer hard drives, speakers and electric motors.
Source:
Ask the Van, Illinois Department of Physics: Strongest Magnet
Virginia Tech Laboratory for Scientific Visual Analysis: Neodymium-Iron-Boron Application
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