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A ring has a diameter of 21 cm and a cross-sectional area of 10 cm?. The
ring is made up of semicircular sections of cast steel, with each joint having
a relactance equal to an air-gap of 0.2mm. Find the ampere-turns required
to produce a flux of 8x10 Wb. The relative permeability's of cast steel and
cast iron are 800 and 166 respectively.

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