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An iron ring of mean diameter 10 cm is uniformly wound with 2000 turns of wire.
When a current of 0.25 A is passed by the coil a flux density of 0.4 T is set up in the iron. Find
(a) The magnetizing force and
(b) The relative permeability of the iron under these conditions.
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Two objects are placed on a flat turntable at 10.0 cm and 20.0 cm from the center, respectively. The coefficient of static friction with the turntable is 0.50. The turntable's
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