Question

The hard ferromagnetic material is characterized by
1)narrow hysteresis loop
2)broad hysteresis loop
3) high mechanically hardness, all over
4) mechanically hard surface

Answer 1

The hard ferromagnetic material is characterized by

1)narrow hysteresis loop

Answer 2

The hard ferromagnetic material is characterized by broad hysteresis. (Option 2).
• The hard ferromagnetic material is characterised by broad hysteresis. which results in large area of hysterisis. Thus, behaves as a hard ferromagnetic material as well as a perment magnet.
• Hard ferromagnetic material : In some ferromagnetic materials, the magnetisation persists on removal of external magnetic field. Such material are called hard magnetic materials. Alnico, an alloy of iron, aluminium, nickel, cobalt and copper is one such material