Chapter 4: Magnetic Effects of Electric Current

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Q
Magnetic Effects of Electric Current

Question:

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

Answer:

Earth wire is a safety measure that provides a low resistance conducting path to the current. Sometimes due to excess heat or wear and tear, the live wire comes in direct contact with the metallic cover of the appliances, which can give an electric shock on touching them. To prevent the shock the metallic part is connected to the earth due to which the current flows to the earth at the instant there is a short circuit.


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