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Re: induced emf again



Ludwik Kowalski wrote:

I am also trying to conceive an experiment which would
demonstrate that in one case the induced E field is
conservative while in another it is not.

If "induced" means induced by a changing magnetic field,
then the Maxwell equations say it is always nonconservative,
so half of the desired experiment is guaranteed to be
inconceivable.

As for the other half: Required equipment:
-- oscilloscope
-- ten feet of simple wire.
Attach one end of the wire to the principal input of the
scope, and attach the other end to the associated reference
input ("ground"). Drape the wire around the lab. Observe
the voltage. If you misapply Kerchhoff's "laws" outside
their domain of applicability, you will predict zero. If
you believe that all electromotive fields are conservative,
you will predict zero. In either case you'll be in for a
surprise.

Also re-arrange the shape of the loop and observe what
happens to the voltage.

For extra credit, modify the apparatus as needed, and use
it to locate the main sources of the nonpotential voltages.