As a DC armature revolves within a stationary magnetic field, the reversals of magnetization of the armature core lags the current reversals which produces heat. What is the correct name for this action which is minimized by the use of soft silicon steel?

Correct Answer: Option B — hysteresis loss

Hysteresis loss occurs when magnetic domains within the armature core resist realignments as the magnetic field reverses, generating heat. Under IEEE 45 guidelines, utilizing high-grade soft silicon steel minimizes this magnetic friction and core heating during operation.