A steel ring of circular section of 1 cm in radius and having a mean circumference of 94.3 cm and air gap of 1 mm long. It is wound uniformly with an exciting coil consisting of 600 turns and excited...

A steel ring of circular section of 1 cm in radius and having a mean circumference of 94.3 cm and air gap of 1 mm long. It is wound uniformly with an exciting coil consisting of 600 turns and excited with a current of 2.5 amp. Neglecting magnetic leakage. Calculate (i) mmf (ii) Magnetic flux (iii) Reluctance (iv) Flux density (v) Relative permeability of steel.

Assume that a steel part takes about 40% of total amp-turns.