A mild steel ring, of relative permeability 500, with a cross-sectional area of 250 mm2 and a mean circumference of 200 mm has a coil with 250 turns wound around it. Determine the reluctance of the...

A mild steel ring, of relative permeability 500, with a cross-sectional area of 250 mm2 and a mean circumference of 200 mm has a coil with 250 turns wound around it. Determine the reluctance of the ring and the current required to produce a fux of 2 mWb in the ring.