Which of the following statements about the hysteresis loop of magnetic materials is correct?
1
The area of the hysteresis loop of a hard material as well as a soft material is not dependent on temperature.
2
The area of the hysteresis loop of a hard material is greater than that of the soft material.
3
The area of the hysteresis loop of a hard material is less than that of the soft material.
4
The hysteresis loops of hard and soft materials are of the same area.