A magnetic circuit consists of silicon steel of 3000 permeability and an air gap. The length of the steel core is 10cm and the air gap is 2cm. Both have the same cross section of 1.5 sq. cm. A current of ½ ampere flows through the windings to produce 2351 maxwells flux. How many turns are there in the coil? Ans. 5000 turns

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