1.

A resistances wire is stretched so as to double its length. Its new resistivity will have a magnitude

Answer»

2 times its ORIGINAL value
4 times its original value
8 times its original value
same as its original value

Solution :When a wire is stretched, its RESISTIVITY REMAINS unchanged. It is because resistivity of a CONDUCTOR depends only on its material and is independent of its length or cross SECTION area.


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