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Identify the statement that is not true regarding hysteresis.

1. Hysteresis is observed in all ferromagnetic materials.
2. The area enclosed by the hysteresis loop is proportional to the heat produced per unit volume of the material.
3. The area enclosed by the hysteresis loop does not depend on the heat produced per unit volume of the material.
4. The form of the hysteresis loop is specific to the material.

Correct answer: The area enclosed by the hysteresis loop does not depend on the heat produced per unit volume of the material.

Solution

This statement is correct because the area of the hysteresis loop is directly related to the energy loss due to magnetic hysteresis, which translates to heat produced per unit volume; therefore, it does depend on this heat production.

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