A ring forming a magnetic circuit is made from two materials;
one part is mild steel of mean length 25cm and cross-sectional area 4cm2, and the remainder is cast iron of mean length 20 cm and cross-sectional area 7.5 cm2 .
Use a tabular approach to verfiy the total mmf needed to cause a flux of 0.30mWb in the magnetic circuit.
find also the total reluctance of the circuit. Use the magnetization curves.