A wire is streched 0.1% longer. find the percent change in resistance?
I missed the class in which the teacher taught this topic so i'm totally blank. He gave a formula that for length you should apply R=2(value)
drived from R = L^2
And for given radius , area or diameter you should apply R=4(value)
drived from R=1/r^4
What do these formulae mean and are they even used?
btw I'm doing MCAT, so anything short would be useful.

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