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What does the magnetism do in maglev trains?

maglev magnetism trains
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What does the magnetism do in maglev trains?

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Maglev is a contraction of Magnetic Levitation. Magnets of the same polarity are used to levitate the train so that there is no friction between train and rail. Electromagnets of opposing polarity are switched on in sequence ahead of the train to pull it forward.

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