# Motion of charged particle in uniform magnetic field

To create a uniform magnetic field I took a current carrying solenoid connected to a battery, then I took a long straight wire connected to another battery, the wire passes from inside the solenoid. We know that motion of a charged particle in uniform magnetic field is helical (in the case when $\mathrm{sin~a}$ is not zero ). So my question is what will be the motion of electrons inside the current carrying wire.. will it be helical? What will be the effect on current carrying wire on its current, potential, etc...

Now come to the wire. Inside wire the electrons have very small mean free path. Now these electrons will frequently collide with the neighboring atoms and will not go in helical path but they will follow random path more or less same without magnetic field. However $r=mv/qB$ and hence if B is large enough it might happen that one or another electron will eventually complete one circle without colliding with neighboring atoms but one should not be very hopeful for this.