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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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Why does a Crookes tube work when connected to an induction coil?
From reading the answer below (regarding the mechanics of an induction coil) and the wikipedia article, it is clear that induction coils produce AC. However, the following excerpt from the "Crookes tu …