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Question

The heating element in an electric iron is made up of :

A
nichrome
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B
iron
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C
constantan
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D
tungsten
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Solution

The correct option is A nichrome
Answer is A.
Nichrome is an ideal material, because it has relatively high resistance and forms an adherent layer of chromium oxide when it is heated for the first time. Material beneath this layer will not oxidize, preventing the wire from breaking or burning out.
Hence, nichrome is used as heating elements.

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