Polyvinyl coating is present in wires because

Options

A. wires are ductile
B. wires are good conductor
C. wires are bad-conductor
D. wires have shining surface

Explanation

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks why polyvinyl coating is used in wires. We need to identify the purpose of this coating.

2. **Identifying Wire Properties**: Wires are typically made of materials that are good conductors of electricity. This means they allow electric current to flow through them easily.

3. **Need for Insulation**: While wires are good conductors, they also need to be insulated to prevent electric shocks and short circuits. Insulation protects users from the electric current flowing through the wire.

4. **Role of Polyvinyl Coating**: Polyvinyl (often referred to as PVC) is used as an insulating material. It provides a protective layer around the conductive wire, ensuring safety by preventing accidental contact with the conductor.

5. **Evaluating Options**: The options given in the question are:
- A) Wires are ductile.
- B) Wires are good conductors.
- C) Wires are bad conductors.
- D) Wires have a shining surface.

Since the main purpose of the polyvinyl coating is to provide insulation for good conductors, the correct answer is option B: "Wires are good conductors."

6. **Conclusion**: Therefore, the reason polyvinyl coating is present in wires is that wires are good conductors of electricity, and the coating serves as insulation to ensure safety.

### Final Answer:
Polyvinyl coating is present in wires because wires are good conductors of electricity, and the coating acts as an insulator.

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