Homework Help: Physics!! Help!!!!!

Posted by Melissa on Wednesday, February 15, 2012 at 1:07am.

A wire of length L and cross-sectional area A has resistance R. What will be the resistance R_stretched of the wire if it is stretched to twice its original length? Assume that the density and resistivity of the material do not change when the wire is stretched.
Express your answer in terms of the wire's original resistance R.

Physics!! Help!!!!! - drwls, Wednesday, February 15, 2012 at 1:15am
The product L*A remains constant after stretching. If L doubles, A decreases by 1/2

Resistance is proportional to L/A.

R2/R1 = L2/L1 *A1/A2 = 4

R1 is the original resistance and R2 is the final resistance.

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