Assertion: meterbridge wire is made up of manganin
Reason: The temperature coefficient of resistance is very small for manganin

Options

A. If both Assertion `&` Reason are True `&` the Reason is a correct explanantion of the Assertion
B. If both Assertion `&` Reason True but Reason is not a correct explanation of the Assertion
C. If Assertion is True but the Reason is False
D. If both Assertion `&` Reason are False.

Answer

To solve the assertion-reason question, we need to analyze both the assertion and the reason provided.

### Step 1: Analyze the Assertion
The assertion states: "Meterbridge wire is made up of manganin."

- **Explanation**: Manganin is indeed used to make the wire of a meter bridge. This is because manganin has properties that make it suitable for precision measurements, such as a low temperature coefficient of resistance and high stability over time.

### Step 2: Analyze the Reason
The reason states: "The temperature coefficient of resistance is very small for manganin."

- **Explanation**: The temperature coefficient of resistance (α) indicates how much the resistance of a material changes with temperature. For manganin, this coefficient is very small, meaning its resistance does not change significantly with temperature variations. This property is crucial for ensuring accurate measurements in a meter bridge.

### Step 3: Conclusion
Since both the assertion and the reason are correct, and the reason provides a valid explanation for the assertion, we can conclude that:

- **Final Answer**: Both the assertion and the reason are correct, and the reason is the correct explanation for the assertion.