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e) The current in a 150 mH air-cored coil changes steadily from...
e) The current in a 150 mH air-cored coil changes steadily from 5.0 A to 15.0 A in 200 ms. (i) What is the average self-induced emf across the terminals of the coil during this change? (ii) How would this result change if the core of the coil were replaced by iron, with relative permeability Mr = 200?