Answer:
Sometimes, the insulation of live
wire is damaged and due to this the live wire touches the metallic body of the
appliances. This causes the flow of current in metallic body. This current
flows to the earth through the earth wire and does not harm the user of
the appliances.
Therefore,
to save the user getting an electric shock due to leakage of current to
metallic body, earth wire must always be used.
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