1. The problem statement, all variables and given/known data compute the average time between collisions T for conduction electrons in copper. 2. Relevant equations Vd=-e*E*T/(Me) Where e is electron's charge E is electric Field T is what i'm solving for And Me is mass of the electron Vd=I/PA 3. The attempt at a solution so it was given that a copper wire with a 1.0mm diameter had a current of 1A...and it's mass density is 8900kg/m^3. So m= 1 electron(8900kg/m^3)(6.02X10^23 atoms/0.0635kg) = 8.4 X 10^28/m^3 So Vd=1A/(8.4X10^28 m^-3)(1.6X10^-19C)(7.9x10^-7m^2) = 9.4 x 10^-5 m/s So now... Vd=-e*E*T/(Me) So T=(Vd)(Me)/(-e)(E) I have Vd, Me is mass of the electron, and -e is charge of the electron. I need the electric force...and am stumped. How do I get it from the given info? Thanks for the help.