Which of the following statements is incorrect about hysteresis \( ...

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Which of the following statements is incorrect about hysteresis
\( \mathrm{P} \)
(1) This effect is common to all ferromagnetic
W substances
(2) The hysteresis loop area is proportional to the thermal energy developed per unit volume of the material
(3) The hysteresis loop area is independent of the thermal energy developed per unit volume of the material
(4) The shape of the hysteresis loop is characteristic of the material
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