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[a] now I'm back to my original question: Given that the Amperian
currents are microscopic, I would think they wouldn't be reduced by
lamination.
They depend only on the relative permeability, which is big for
iron.
[b] So why doesn't the self-inductance of a Pasco coil increase by
thousands (instead of only 10) when I put a laminated iron bar into
its core? The magnetization field should only depend on the Amperian
currents, not on the actual continuity of the field line loops,
shouldn't it? A whole bunch of adjacent microscopic loops act like
one big loop, right?