Originally posted by Doug1
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Last post here also.
Edit. Not last post to reply to more insults.
From Richard Feyman, Nobel Prize Winner 1965, in his lectures Vol.2 Chapter 17:
"So the “flux rule”—that the emf in a circuit is equal to the rate of change of the magnetic flux through the circuit—applies whether the flux changes because the field changes or because the circuit moves (or both). The two possibilities—“circuit moves” or “field changes”—are not distinguished in the statement of the rule. Yet in our explanation of the rule we have used two completely distinct laws for the two cases—v×B for “circuit moves” and ∇×E=−∂B/∂t for “field changes.”
We know of no other place in physics where such a simple and accurate general principle requires for its real understanding an analysis in terms of two different phenomena. Usually such a beautiful generalization is found to stem from a single deep underlying principle. Nevertheless, in this case there does not appear to be any such profound implication. We have to understand the “rule” as the combined effects of two quite separate phenomena."
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