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An iron ring of relative permeability μr. has windings of insulated copper wire of n turns per metre.

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An iron ring of relative permeability μr. has windings of insulated copper wire of n turns per metre. When the current in the windings is I, find the expression for the magnetic field in the ring.

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Apply Ampere's Law for the magnetic field due to iron ring wounded by insulating copper wire, having current

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