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Question

Identify the earthing pin in the plug:

A
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B
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C
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D
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Solution

The correct option is A
The longest pin in the plug serves as the earthing pin. It is the longest of all so that during insertion in the socket it gets to be the first pin to get connected and during removal it is the last pin to be removed. In this way it is ensured that the protection for appliances is in place before they get connected to current and they remain protected till they are not removed from the circuit.

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