Assertion : A domestic electrical appliance working on a three pin continue working even if the top pin is removed
Reason : The third pin is used only as safety device.

Options

A. If both assertion and reason are ture and reason is the correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion
C. If assertion is true but reason is false
D. If both assertion and reson are false.

Answer

To solve the question, we need to analyze both the assertion and the reason provided.

**Assertion:** A domestic electrical appliance working on a three pin continues working even if the top pin is removed.

**Reason:** The third pin is used only as a safety device.

### Step-by-Step Solution:

1. **Understanding the Three Pins:**
- In a three-pin plug, there are typically three connections: Live (L), Neutral (N), and Earth (E).
- The Live wire carries the current to the appliance, the Neutral wire returns the current, and the Earth wire is a safety feature.

2. **Function of the Earth Wire:**
- The Earth wire (the third pin) is designed to prevent electric shock by providing a path for excess current to flow safely into the ground in case of a fault (e.g., short circuit).
- It does not carry current during normal operation of the appliance.

3. **Effect of Removing the Earth Pin:**
- If the Earth pin (top pin) is removed, the appliance can still function as long as the Live and Neutral connections are intact.
- The appliance will still operate normally because the essential current flow is maintained through the Live and Neutral wires.

4. **Evaluating the Assertion:**
- The assertion states that the appliance continues to work if the top pin (Earth pin) is removed. This is true because the appliance can still complete the circuit with the Live and Neutral wires.

5. **Evaluating the Reason:**
- The reason states that the third pin (Earth pin) is used only as a safety device. This is also true, as the Earth wire's primary function is to provide safety against electric shocks.

6. **Conclusion:**
- Both the assertion and the reason are true.
- The reason correctly explains the assertion because the Earth pin's role as a safety device does not affect the appliance's ability to operate when it is removed.

### Final Answer:
Both assertion and reason are true, and the reason is the correct explanation of the assertion.