The hysteresis loop of a soft iron piece has a much smaller area than that of a carbon steel plece. If the material is to go through repeated cycles of magnetisation, which piece will dissipate greater heat energy?

Explanation

(b) Heat loss per one hysterisis cycle is equal to area enclosed in the loop. Hence, carbon steel piece will dissipate greater heat energy as it has greater area enclosed in its hysterisis loop (as per the statement).