5.3) Draw the impedance triangle and its corresponding R-L circuit diagram. (ii) What does this impedance
triangle enable us to calculate?
b) A ring has a diameter of 21cm and a cross-sectional area of 10cm². The ring is made up of semi-
circular sections of cast iron and cast steel with each joint having reluctance equal to air-gap of 0.2mm
Find the ampere-turns required to produce a flux of 6 x 10-Wb. The relative permeabilities of cast
steel and cast iron are 800 and 166 respectively.
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