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An iron ring of relative permeability mu...

An iron ring of relative permeability `mu_r`, has windings of insulated copper wire of n turns per unit length. When the current in the windings is I, find the expression for the magneitc field in the ring.

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If the anchor ring is an iron ring of relative permiability `mu_r`, then magentic field in iron ring will become
`B = mu_0 mu_r, nI`.
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U-LIKE SERIES-MOVING CHARGES AND MAGNETISM -LONG ANSWER QUESTIONS-I
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