A section through a magnetic circuit of uniform cross-sectional area 2 cm2 as shown in the figure. The cast steel has a mean length of 25 cm. The air gap is 1 mm wide and the coil has 5000 turns. The magnetic field intensity for B = 0.8 T is 750 A/m. Determine the current (in A, up to two decimal places) in the coil to produce a flux density of 0.80 T in the air gap, assuming that all the flux passes through both parts of the magnetic circuit.
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