electron and proton movement through magnetic fields

Question

I was wondering what causes protons and electrons to move in opposite directions when entering a constant magnetic field. I know that they both move in circular paths but I do not know how to tell the difference between a proton and an electron in a magnetic field. Thanks so much!

Answer 1

The component of the velocities parallel to the magnetic field will not change as B-field will nit act on it. The perpendicular components of the velocities to the B-field will experience Magnetic Forces in the OPPOSITE directions. Therefore, the direction of their spins will be opposite.