Finding Length and Diameter Of A Wire

[Bashyboy]

Homework Statement

Suppose you wish to fabricate a uniform wire from 2.00 g of copper. The wire is to have a resistance of* R = 0.480 Ω*and all the copper is to be used.

Homework Equations

The Attempt at a Solution

In the problem, they suggest using this relationship for resistance $R=\rho A l$. How did they get that? From my understanding, resistance is $R = \rho \frac{l}{A}$

 

[ehild]

You are right, R=ρL/A.

ehild

 

[Chestermiller]

The mass is $M=Ald$, where d is the density.