Have you done this test? If so, why not tell us your results. If not, then suggesting that differences might result from changes in the distribution of the magnetic field (if you mean the permanent field) is a bit premature. Adding a steel plate alters the electrical properties of the two coils. That is, the field produced by a test current through the coil (such as used by an inductance meter or a driver coil) is different and thus the inductance changes. The permanent field has no direct role in the changes.
Originally posted by bbsailor
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