The thick long pin in a three pin plug is connected to the

kWh wire

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live wire

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earth wire

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neutral wire

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Solution

The correct option is C earth wire
The pin which is long and thick in a three pin plug is the earth pin. It ensures safety against electric shock.
It is made thick to avoid inserting it into the live wire socket by mistake. Also, it is made long to ensure that it is always connected prior to the connection of live wire.

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