Hey Neal,
actually its not simple physics, if it was it would be in the standard
hi school textbook :)
laminated cores reduce the effect known as eddy currents which become
a problem in solid core transformers ( and the only solid core ones
Ive seen are for RF usage)."
The "solid" cores for RF usage aren't - they consist of either
finely divided iron particles embedded in an insulating matrix or else
are made of ferrite materials which have such a high resistivity that
eddy current loss is negligible.
Ed
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