Which material is used for making the central rod in an electric cell ?

Options

A. Copper
B. Carbon
C. Aluminium
D. Iron

Answer

To determine which material is used for making the central rod in an electric cell, we can analyze the options provided: Copper, Aluminium, Carbon, and Iron.

### Step-by-Step Solution:

1. **Understanding the Function of the Central Rod**: The central rod in an electric cell, also known as the electrode, plays a crucial role in conducting electricity. It must be a good conductor of electricity.

2. **Evaluating the Materials**:
- **Copper**: Copper is an excellent conductor of electricity and is commonly used in electrical applications. However, it is not typically used as the central rod in most common electric cells.
- **Aluminium**: Aluminium is also a good conductor but is less common in electric cells compared to other materials.
- **Carbon**: Carbon, particularly in the form of graphite, is widely used as the central rod in many types of electric cells, including batteries. It is a good conductor and has properties that make it suitable for this purpose.
- **Iron**: Iron is a conductor but is not commonly used for the central rod in electric cells due to its tendency to corrode.

3. **Conclusion**: Based on the evaluation, the material most commonly used for making the central rod in an electric cell is **Carbon**.

### Final Answer:
The material used for making the central rod in an electric cell is **Carbon**.

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