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A coil of 600 turns is wound uniformly on a ring of non-magnetic material. The ring has a uniform cross-sectional area of 200mm2 and a mean circumference of 500mm. If the current in the coil is 4A, determine
(a) The magnetic field strength,
(b) The flux density, and
(c) The total magnetic flux in the ring.
Determine an expression for the current in the ring jumping ring demonstration, an electromagnet provides magnetic field of B=0.2 cos 377t tesla over a circle of radius 1.2cm
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