Neglect the leakage flux outside the air gap.

Neglect the leakage flux outside the air gap.




Estimate the number of ampere-turns necessary to produce a flux of 0.5m wb round an iron ring of 5cm2 x-section and 30 cm mean diameter, having an air gap of 1mm wide across it.  Assume the relative permeability of iron as 1000. Neglect the leakage flux outside the air gap.





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