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**1. 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?

**2. Homework Equations**

R = pL/A

L = 2

A = 1/2

p = how do i find p

**3. The Attempt at a Solution**

p stand for resistivty but how do i know it in this problem