Find the current necessary to establish a flux of ? = 3 × 10?4 Wb in the series magnetic circuit of Figure P18.12. Here liron = lsteel = 0.3 m, area (throughout) = 5 × 10?4 m2, and N = 100 turns. Assume ?r = 5,195 for cast iron and ?r = 1,000 for cast steel.
Analysis:
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