The wire having a black plastic covering is a

Options

A. live wire
B. neutral wire
C. earth wire
D. none of these

Answer

### Step-by-Step Solution:

1. **Understanding Wire Colors**: Wires are often covered with different colored plastic coatings. Each color typically represents a specific function of the wire in electrical systems.

2. **Identifying the Black Wire**: In electrical wiring, the black wire is commonly used to denote the neutral wire. This is a standard convention in many electrical systems.

3. **Types of Wires**: There are generally three types of wires:
- **Live Wire**: Usually colored red or brown, it carries the current to the load.
- **Neutral Wire**: Typically colored black, it carries the current away from the load and completes the circuit.
- **Earth Wire**: Often colored green or yellow, it is a safety wire that prevents electrical shock by directing excess current to the ground.

4. **Conclusion**: Since the question specifies a wire with a black plastic covering, we can conclude that this wire is a neutral wire.

5. **Final Answer**: The wire having a black plastic covering is a **neutral wire**.