A coil is wound uniformly with 500 turns over a steel ring of relative permeability 900, having a mean diameter of 40 mm cut with air gap 0.2 mm and cross-sectional area of 50 mm2 and the flux density...

A coil is wound uniformly with 500 turns over a steel ring of relative permeability 900, having a mean diameter of 40 mm cut with air gap 0.2 mm and cross-sectional area of 50 mm2 and the flux density in it 0.5T. Find the current of passed through the coil and total .reluctance of ring