A ring has a mean diameter of 21 cm and cross sectional area of 10 cm2

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A ring has a mean diameter of 21 cm and cross sectional area of 10 cm2. the ring is made up of semi-circular sections of cast iron and cast steel with each joint having reluctance equal to an air gap of 0.2 mm. find the ampere turns required to produce a flux of 0.8 milli-wb. the relative permeability of cast steel and cast iron are 800 & 166 respectively. neglect fringing and leakage effects.