A ring of a mean diameter 25 cm and cross sectional area of 20 cm² .Assume it is made up of four semi-circular parts two cast iron and two cast steel. If each joint has an air gap of 0.25 mm. Find amper turns required to produce a flux of 9 x 10^-4 weber in the magnetic circuit. The relative permeability of steel and iron are 852 and 165 respectively.

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Now A Ring hap sectional Hence where Given that Now ie arra of 20mm2 ... View the full answer