Assertion At high temperature, a ferromagnet becomes a paramagnet.
Reason: The ferromagnetic property depends on temperature.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true and reason is not the correct explanation of assertion.
C. If assertion is ture but reason is false.
D. If both assertion and reason are false.

Explanation

To solve the question, we need to analyze the assertion and the reason provided in the context of magnetism.

### Step 1: Understand the Assertion
The assertion states that "At high temperature, a ferromagnet becomes a paramagnet." This is a true statement.

- **Explanation**: Ferromagnetic materials have a strong magnetic ordering due to the alignment of magnetic moments in the material. However, when the temperature increases significantly, thermal agitation disrupts this alignment, leading to a loss of ferromagnetism and a transition to paramagnetism.

### Step 2: Understand the Reason
The reason states that "The ferromagnetic property depends on temperature." This is also a true statement.

- **Explanation**: The ferromagnetic properties of materials are indeed temperature-dependent. As temperature increases, the thermal energy can overcome the magnetic interactions that maintain the alignment of magnetic moments, causing the material to lose its ferromagnetic properties.

### Step 3: Determine the Relationship
Now we need to determine if the reason correctly explains the assertion.

- Since the assertion is true and the reason is also true, and the reason provides an explanation for why the assertion is true (i.e., the dependence of ferromagnetic properties on temperature leads to a transition to paramagnetism at high temperatures), we conclude that the reason is indeed a correct explanation of the assertion.

### Conclusion
Both the assertion and the reason are true, and the reason is the correct explanation for the assertion.

### Final Answer
- **Assertion**: True
- **Reason**: True
- **Explanation**: The reason correctly explains the assertion.

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