1. The problem statement, all variables and given/known data A piece of copper wire joins a piece of aluminum wire whose diameter is five times that of the copper. The same current flows in both wires. The density of conduction electrons in copper is 1.1 [tex]\times[/tex] 1029 m-3 in aluminum it is 2.1[tex]\times[/tex]1029 m-3. what is the drift speed and current density in each? 2. Relevant equations I = nAqVd J = nqVd 3. The attempt at a solution the cross sectional area is unknown and the current is unknown. i think the drift speed of one will be a function of the other. I have an expression but since i am using a web software, i would like to see if someone else gets the same expression as i do.