Curie temperature is the temperature above which

Answer

To solve the question regarding the Curie temperature, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding Ferromagnetic Materials**:
- Ferromagnetic materials have their magnetic moments aligned in the same direction, resulting in a strong magnetic field. This alignment is stable at lower temperatures.

2. **Definition of Curie Temperature**:
- The Curie temperature (Tc) is a specific temperature above which a ferromagnetic material loses its permanent magnetic properties.

3. **Effect of Heating Above Curie Temperature**:
- When the temperature of a ferromagnetic material is increased beyond its Curie temperature, the thermal energy disrupts the alignment of the magnetic moments.

4. **Transition to Paramagnetism**:
- As the alignment breaks down, the material transitions from a ferromagnetic state to a paramagnetic state. In the paramagnetic state, the magnetic moments are randomly oriented and only align in the presence of an external magnetic field.

5. **Conclusion**:
- Therefore, the correct answer to the question is that the Curie temperature is the temperature above which ferromagnetic material becomes paramagnetic.

### Final Answer:
Curie temperature is the temperature above which ferromagnetic material becomes paramagnetic.

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