All these magnetic materials loss their magnetic properties when

Answer

**Step-by-Step Solution:**

1. **Understanding Magnetic Materials**: Magnetic materials are classified based on their magnetic properties. They can be ferromagnetic, paramagnetic, or diamagnetic. Each type has a specific behavior in the presence of a magnetic field.

2. **Temperature Effect on Magnetism**: All magnetic materials lose their magnetic properties when subjected to high temperatures. This phenomenon is primarily due to thermal agitation, which disrupts the alignment of magnetic domains within the material.

3. **Curie Temperature**: The specific temperature at which a ferromagnetic material loses its permanent magnetic properties is called the Curie temperature (Tc). Above this temperature, the material becomes paramagnetic, meaning it can still be influenced by an external magnetic field but does not retain magnetization in the absence of that field.

4. **Demagnetization Process**: When a magnetic material is heated beyond its Curie temperature, the thermal energy overcomes the magnetic forces that align the magnetic domains. As a result, the material loses its ability to be magnetized.

5. **Conclusion**: Therefore, all magnetic materials lose their magnetic properties when they are heated to a temperature above their Curie temperature.

**Final Answer**: All magnetic materials lose their magnetic properties when heated above their Curie temperature.

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