Determine the mmf essential to establish a flux, Physics

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(a) A cast steel ring has a cross-sectional area of 600mm² and a radius of 25mm. Verify the mmf essential to establish a flux of 0.8mWb in the ring. Use the B-H curve for cast steel.

(b) If a radial air gap 1.5mm wide is cut in the ring of part.

Find the mmf now essential to maintain the similar flux in the ring.

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