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I hope I am not alone who appreciates Michael's effort to bring
John's formulation closer to those who do not manipulate "divs
and rots" routinely.
A changing current induced in the circuit of the secondary
windings of a transformer can not be distinguished from the
ac part of a current produced by a battery (for example by
modulating the value of R). Amperes seem to be more real
(less dependent on interpretations) than volts.
Ludwik Kowalski
Michael Edmiston wrote:
...
(3) In electrodynamics, electric field lines created by changing magnetic
fields form loops... no beginning, no ending.
points(5) Therefore, the work-energy situation involved in moving or allowing
charge to move in a loop of magnetically induced electric field involves
work and/or energy changes even though the charge began and ended at the
same position. This is inconsistent with our position-based definition of
electric potential difference.
It's amazing to me that even though I basically have known and taught
(1) through (4) for a considerable number of years, this current list
discussion has only now brought point (5) to my attention....
Michael D. Edmiston, Ph.D.