Electromagnetism

Microwaves make water molecules in food rotate and heat up. Metal sparks when microwaves push charge onto sharp edges or points, creating an electrical arc.

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Starter thread · AI-reviewed against its sources

A coil under the glass sends a rapidly changing magnetic field into the pan, which induces electric currents in the metal. The pan's resistance turns those currents into heat.

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Starter thread · AI-reviewed against its sources