Explain the self inductance of the coil, Physics

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A silicon iron ring is wound with 800 turns, the ring having a mean diameter of 120mm and a cross-sectional area of 400mm².

If when carrying a current of 0.5 A the relative permeability is found to be 3000, calculate

(a) the self inductance of the coil,

(b) the induced e.m.f. if the current is reduced to zero in 80ms.

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