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Q.

What is the function of an earth wire? Why is it necessary to earth metallic appliances?

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Detailed Solution

The main function of earth wire is to protect appliances from sudden damage due to leakage of current. 

The earthing of metallic appliances is necessary to prevent severe electric shock to the users. The metallic body of electric appliances is connected to earth wire so that any leakage of electric current is transferred to the ground. 

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