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A coil of 300 turns is wound uniformly on a ring of non-magnetic material. The ring has a mean circumference of 40cm and a uniform cross-sectional area of 4cm2. If the current in the coil is 5 A, calculate
(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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