Science
What is the function of an earth wire? Why is it necessary to earth metallic appliances?
Electro-Magnetism
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Answer
Earth wire is used as a safety measure to ensure that any leakage of current to the metallic body of appliances does not give any severe shock to the user.
Earthing metallic appliances provides a low-resistance conducting path for the current. Thus, it ensures that any leakage of current to the metallic body of the appliance keeps its potential to that of the earth, and the user may not get a severe electric shock.
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