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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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Would a hypothetic very fast camera allow to visualize the variations of the amplitude of vi...
That depends on your specific setup. There are light detectors that are sensitive to the total light intensity (which is constant over time) and there are detectors which are sensitive to the electric …