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An iron ring of circular cross sectional area of 3 cm2 and mean diameter of 20 cm is wound with 500 turns of wire and

An iron ring of circular cross sectional area of 3 cm2 and mean diameter of 20 cm is wound with 500 turns of wire and carries a current of 2A to produce the magnetic flux of 0.5mWb in the ring. Determine the permeability of the material.

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