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Re: induced emf and eddy currents



Dear Carl + other people:
Your questions make perfectly sense and are correct. If, for example,
after cutting the loop open, you measue the emf with a voltmeter,
and the wire connecting it runs side by side with the wire of the
loop (in opposite sense), you will measure (nearly) zero. But in practice
there is usually an "obvious" way to close the loop for measuring
the emf. I give you an example: take a transformer, which produces
an emf. in its secondary circuit from the current through its
primary circuit. If the secondary emf. is, say, 2000 volt, you better
don't touch it, in spite of the fact that, when the secondary circuit
is not closed, there is not induced emf., strictly speaking.
Regards Emilio