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In article writes:

"Monte McGuire"...
Actually, it's current that gets induced by a changing magnetic field,

"Phil"
** Wrong - a voltage is induced. The current that flows depends on the
impedances, conductor cross section etc.

"Mike"
********* Horsie Maneuveres - Voltage is never induced. Voltage is
the potential difference between the two ends of a lump of impedance
as a result of the current flowing through the impedances around the
circuit.

This is basic electricity.

** A balanced audio line that is **NOT** twisted is just an induction loop.

********* Simplistic and incorrect conclusion - It's two induction
loops. If they're identical and have identical impedances (including
the distribution of those impedances) voltages resulting from the
induced current will sum to zero at a differential amplifier (which
we, for convenience, call a "balanced input.")

What you're describing (as well as your declaration of an "impedance
balanced source" is true and applicable for a single-wire connection.
But when dealing with common mode conditions, it takes two to tango.
Without two, you can't have common mode because there's nothing with
which to be common.

--
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