The heat loss due to the friction of molecules during magnetization is called what?

• A. Hysteresis
• B. Copper
• C. Iron
• D. Dielectric

Answer: (A)

Hysteresis loss. When a magnetic material is cycled through magnetization, domain walls move and spins realign with the changing field, and this process involves irreversible friction-like interactions inside the material. The energy dissipated as heat per cycle corresponds to the area inside the B–H loop on a magnetization curve. So the heat produced during magnetization cycles is called hysteresis loss. Copper, iron, and dielectric refer to materials or other loss mechanisms (resistive heating in conductors, general material type, and dielectric losses in insulators, respectively) and do not describe this magnetic heat loss.