Which of the following statements is incorrect about hysteresis ?
This effect is common to all ferromagnetic substances
The hysteresis loop area is proportional to the thermal energy developed per unit volume of the material
The hysteresis loop area is independent of the thermal energy developed per unit volume of the material
The shape of the hysteresis loop is characteristic of the material
The statement that the hysteresis loop area is independent of the thermal energy developed per unit volume of the material is incorrect.