Question

a given wire of resistance 1ohms is stretched to double its length .what will be its new resistance

Answer 1

4 times ....
as length becomes double , area becomes half simultaneously....
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Answer 2

Heya friend....☺☺☺

Here is your answer....

As we know that :

⚫. Resistance = Resistivity * length/ area

Now, we have when the wire is stretched to double it's length , the area of cross section gets reduced to half.

So, New Resistance = Resistivity * 2 * length/area/2
New Resistance = ( Resistivity * area/ length) * 4

So, when the wire is stretched double it's length , the resistance gets multiplied by 4 i.e, it becomes 4 times.

Thanks.....☺☺☺

Hope this will help you.....