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The classical theory of electric and magnetic fields, both in the static and dynamic case. It also covers general questions about magnets, electric attraction/repulsion, etc. Distinct from electrical-engineering.

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What makes light to be a special part of the electromagnetic spectrum that it has a particle? [duplicate]

Why only light has photons while x-ray or micro/radio waves don't? If we build a device that can iterate over all frequencies, what will be so special about the light range that it will start to gen …
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