Force on electron from current-carrying wire

[dvdqnoc]

Homework Statement

http://img236.imageshack.us/img236/5369/physxn6.png

Homework Equations

F = IL x B
F = QV x B

The Attempt at a Solution

Since I know I, L, Q, and V, I tried to work those into the two force equations... but I got no where. They don't give me B.

 

[Shooting Star]

Since I know I, L, Q, and V, I tried to work those into the two force equations... but I got no where. They don't give me B.

Surely you can find B at a given distance from a long wire carrying a known current? Do you remember how the magnetic lines of force are around a straight wire?

 

[Nabeshin]

In getting the force you need to find the B-field first, either by applying the law of Biot-Savart or Ampere's law. Of course you could also have it memorized, but that just takes all the fun out of it.. :)