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. . .60Hz
There is a power assymmetry as between the bob approach
and the bob departure in either case which effectively modulates the
current. A change in inductance causes a marked change in current, sothe
current rises with the approach of the bob. The current peaks however,unbalanced
after the bob has passed the center of the solenoid. It is this
force which maintains the pendulum in a strikingly simple way.
Whatcott Altus