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The variation of magnetic susceptibility...

The variation of magnetic susceptibility `(chi)` with absolute temperature `T` for a ferromagnetic material is

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The correct Answer is:
A
Susceptibility of a ferromagnetic substance falls with rise of temperature `(chi = (c)/(T- T_(c)))` and the substance becomes paramagnetic above Curie temperature, so magnetic susceptibility becomes very small above Curie temperature.
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ERRORLESS-MAGNETISM-NCERT BASED QUESTIONS (Magnetic Materials)
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  2. In a permanent magnet at room temperature.

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  6. For an isotropic medium B, mu, H and M are related as (where B, mu(0),...

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  7. When a piece of a ferromagnetic sobstance is put in a uniform magnetic...

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  8. If a ferromagnetic material is inserted in a current carring solenoid,...

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  9. Curie's law can be written as

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  10. The magnetic susceptibility of any paramagnetic material changes with ...

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  11. Curie temperature is the temperature above which

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  12. Curie-Weiss law is obeyed by iron at a temperature….

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  13. The magnetic susceptibility of a paramagnetic substance at - 173 .^(...

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  14. A domain in a ferromagnetic substance is in the form of a cube of side...

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  16. The material suitable for making electromagnets should have

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  17. The use of study of hysteresis curve for a given material is to estima...

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  18. The area of hysteresis loop of a material is equinalent to 250 joule. ...

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  19. For substance hysteresis (B-H) curve are as shown in figure. For makin...

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  20. A curve between magnetic moment and temperature of magnet is

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