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A coil is wound uniformly with 300 turns over a steel ring of relative permeability 900,...

  1. A coil is wound uniformly with 300 turns over a steel ring of relative permeability 900, having a mean circumference of 40 mm and cross-sectional area of 50 mm2. If a current of 25 amps is passed through the coil, find (a) m.m.f. (b) reluctance of the ring and (c) flux. Ans: [(a) 7500 AT (b) 0.7 x 106 AT/Wb (c) 10.7 mWb]
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