Question

What will be the consequence of heating a ferromagnetic material above its curie temperature?

• A. Ferromagnetic domains becomes perfectly arranged.
• B. Ferromagnetic substance becomes paramagnetic.
• C. Ferromagnetic domains are not influenced.
• D. Ferromagnetic material changes into diamagnetic material.

Answer 1

The correct option is B Ferromagnetic substance becomes paramagnetic.

For ferromagnetic substance, in presence of an applied field, domains get aligned with the applied magnetic field. The combined effect of the atomic magnetic moments results in a relatively large magnetization. These ordered domains persist even after removing the external magnetic field.

When the ferromagnetic substance is heated above its curie temperature, it loses its ferromagnetism and becomes paramagnetic.

Since it becomes paramagnetic, the magnetic dipoles are randomly arranged.