Heaters with 2 permanent magnets placed in vacuum repel each other

 Heaters with 2 permanent magnets placed in vacuum repel each other.Electric motors such as fans, when kept from spinning, generate heat because the magnetic fields repel each other. it also keeps energy converted to heat, so we let two permanent magnets repel each other to generate heat.But it heats slowly, it cools the air, so we put it in a vacuum to keep the heat hot

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