"Richard Harrison" wrote in message
...
Yes, a phase reversal is produced by the change of current direction
between the outside and inside surfaces of the loop shield. But carry
your logic a bit further. There is a second phase reversal provided by
the inductive coupling between the inner surface of the loop shield and
the wire loop inside the shield.

Sure, of course... but there's also a (single) phase reversal in the
unshielded loop. Hence the overall difference between the shielded and
unshielded loop is still a single phase reversal. Or do you disagree?

---Joel