The wire of potentiometer is made of

Options

A. copper
B. steel
C. manganin
D. aluminum

Answer

To solve the question regarding the material used for the wire of a potentiometer, we will analyze each option based on the properties required for a potentiometer wire.

### Step-by-Step Solution:

1. **Understanding the Purpose of a Potentiometer**:
- A potentiometer is used to measure voltage or resistance. It requires a wire that can provide a stable and precise measurement.

2. **Properties of Potentiometer Wire**:
- The wire should have high resistivity to allow for a wide range of measurements. This means that the material should resist the flow of electric current effectively.
- The wire should also have a low temperature coefficient of resistance. This means that as the temperature changes (due to current flow), the resistance should not change significantly. This stability is crucial for accurate measurements.

3. **Analyzing the Options**:
- **Copper**: While copper has good conductivity, it does not have high resistivity and a low temperature coefficient, making it less suitable for a potentiometer wire.
- **Steel**: Steel has higher resistivity than copper, but it also has a higher temperature coefficient, which can lead to significant changes in resistance with temperature fluctuations.
- **Manganese**: Manganese is often used in alloys and has a higher resistivity. However, it is not commonly used alone for potentiometer wires.
- **Aluminum**: Aluminum has good conductivity and is lightweight, but it also does not have the desired properties of high resistivity and low temperature coefficient.

4. **Conclusion**:
- The best option for the wire of a potentiometer is an **alloy**. Alloys can be engineered to have high resistivity and low temperature coefficients, making them ideal for this application. Among the options provided, **manganese** (often used in alloys) is the most suitable choice.

### Final Answer:
The wire of the potentiometer is made of **Manganese** (as part of an alloy).