Explanation:

1. May be zero:
When a ferromagnetic material goes through a hysteresis loop, its magnetic susceptibility may be zero at certain points. This occurs when the material reaches its saturation point, where further increase in magnetic field strength does not result in a corresponding increase in magnetization. At this point, the material is fully magnetized and any additional magnetic field does not affect its magnetization.

2. May be infinity:
In some cases, the magnetic susceptibility of a ferromagnetic material may approach infinity. This typically happens when the material is in the vicinity of its Curie temperature, which is the temperature at which it loses its ferromagnetic properties. Near the Curie temperature, the material becomes highly responsive to changes in magnetic field strength, leading to an extremely high magnetic susceptibility.

3. May be negative:
Lastly, the magnetic susceptibility of a ferromagnetic material can also be negative under certain conditions. This occurs when the material exhibits antiferromagnetic or diamagnetic behavior, where its magnetic moments align in an antiparallel manner or oppose the external magnetic field, respectively. In such cases, the material's response to an applied magnetic field is opposite to that of a typical ferromagnetic material, resulting in a negative magnetic susceptibility.

Overall, the magnetic susceptibility of a ferromagnetic material during hysteresis loop can vary widely depending on factors such as saturation, temperature, and magnetic alignment, leading to values that may be zero, infinity, or negative.