Determine magnetic circuit of uniform cross-sectional area, Physics

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A section through a magnetic circuit of uniform cross-sectional area 2cm2 is shown in Figure.

The cast steel core has a mean length of 25cm. The air gap is 1mm wide and the coil has 5000 turns.  

Verify the current 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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