An iron ring, of constant relative permeability 500, is wound with a coil of 400 turns and a current of 2 A passed through it. If the ring has a mean circumference of 400 mm and a uniform...

An iron ring, of constant relative permeability 500, is wound with a coil of 400 turns and a current of 2 A passed through it. If the ring has a mean circumference of 400 mm and a uniform cross-sectional area of 300 mm2 , determine the resulting magnetic feld strength, fux density and fux in the ring.