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.
Stacey Warren - Expert brainly.com
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Resistance = \(\rho\)L/A
Change in Resistance = \(\rho\)(Change in Length)/A
In other words, 0.1% increase in length should result in about 0.1% increase in resistance.
Change in Resistance = -\(\rho\)L(Change in Area)/A^2 = -(Original Resistance)(Change in A)/A
That should be it. but the answer in my notebook is .2%
they used a formula
R= 2(percent change in length) i don't know why.