In an electric cell , a metal cap on the top of the carbon rod acts as

Options

A. the isulated material
B. the positive terminal of the cell
C. the negative terminal of the cell
D. a switch of the cell .

Explanation

To solve the question regarding the function of the metal cap on the top of the carbon rod in an electric cell, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding the Structure of an Electric Cell**:
- An electric cell consists of two main components: a carbon rod and a metal casing. The carbon rod is typically the positive terminal, while the metal casing or disc at the bottom acts as the negative terminal.

2. **Identifying the Metal Cap**:
- The metal cap is located at the top of the carbon rod. This cap is crucial for the functioning of the electric cell.

3. **Function of the Metal Cap**:
- The metal cap serves as a connection point for the positive terminal of the electric cell. It allows the electric current to flow out of the cell into the circuit.

4. **Analyzing the Options**:
- Given the options:
- Option 1: Insulated Matrix
- Option 2: Positive Terminal of the Cell
- Option 3: Negative Terminal of the Cell
- Option 4: Switch of the Shell
- Based on our understanding, the metal cap acts as the positive terminal of the cell.

5. **Conclusion**:
- Therefore, the correct answer is **Option 2: Positive Terminal of the Cell**.