Question

The top pin of a three-pin plug if for

• A. live wire
• B. Earth wire
• C. Neutral wire
• D. any of the above

Answer 1

The correct option is B

Earth wire

The explanation for correct option:

1. The ‘three-pin plugs’, have three pins which are the live pin, neutral pin, and earth pin.
2. Among these three pins (live, neutral and earth), the earth pin is made longer and thicker than the other two pins.
3. So that when we insert the plug into the socket, the earth pin comes into contact with the power supply before the other two pins.
4. This is because if any unwanted charges are there then they will be removed (grounded) before the other two pins will go inside the terminals.
5. The top pin is for Earth wire.

Hence, option (B) is the correct option.