- #1
zelda1850
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Homework Statement
a copper wire of length of length L and cross sectional area A has resistance R. A second copper wire at the same temperature has a length of 2L and a cross sectional area of 1/2 A. what is the resistance of the second copper wire?
Homework Equations
R = pL/A
L = 2
A = 1/2
p = how do i find p
The Attempt at a Solution
p stand for resistivty but how do i know it in this problem