@ Chris B : If you take a look at my most recent paperĀ ...
Which one is this ? I think the old links to your work are buried here
elsewhere.
How slow does a field have to be varying before it no longer induces
eddy currents in shielding material?  [and thus cause a reactive
screen.]
This occurs in electronics all the time or TV / CRTs would never work
linearly.
A steady field, in itself, would not cause hum.

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