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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