An iron ring has a X-section of 3 cm² and a mean diameter of 25 cm. An air-gap of 0.4 mm has been cut across the section of the ring. The ring is wound with a coil of 200 turns through which a current of 2 A is passed. If the total magnetic flux is 0.24 mWb, find the relative permeability of iron, assuming no magnetic leakage.

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024 mWb A 3 cm2 3 104 m2 B A 024 103 3 104 08 Wbm2 A... View the full answer