Which of the following options is INCORRECT in reference to a ferromagnetic substance?
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A.
In a ferromagnetic material, the field lines are highly concentrated.
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B.
In hard ferromagnetic, the magnetisation persists on removal of the external field.
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C.
In soft ferromagnetic, the magnetisation disappears on removal of the external field.
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D.
The ferromagnetic property is independent of the temperature.
Correct Answer:
D. The ferromagnetic property is independent of the temperature.
Explanation:
Ferromagnetism is a property of certain materials that allows them to become permanently magnetized. This magnetic behavior is highly sensitive to temperature. As the temperature of a ferromagnetic substance increases, the thermal agitation begins to disrupt the alignment of atomic dipoles. When the temperature reaches a specific threshold known as the Curie temperature, the material loses its ferromagnetic properties and transitions into a paramagnetic state. Thus, the statement that the ferromagnetic property is independent of temperature is incorrect, as these properties are significantly influenced by thermal changes.
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