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A mild steel ring has a radius of 50 mm and a cross-sectional area of 400 mm. A current of 0.5 A flows in

A mild steel ring has a radius of 50 mm and a cross-sectional area of 400 mm. A current of 0.5 A flows in a coil wound uniformly around the ring and the flux produced is 0.1 mWb. If the relative permeability at this value of current is 200, find (a) the reluctance of the mild steel and (b) the number of turns on the coil.

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