A cast steel electro magnet has an air gap length of 3mm and an iron path of length 40cm. Find the number of ampere turns necessary to produce a flux density of 0.7wb/m^2 in the air gap. Neglect leakage. Assume ampere turns required for air gap to be 70% of the total ampere turn.

e) none of the above answers are correct

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temp rises, and expansion