velocity of proton following a helical path?? need a bit of help 1. The problem statement, all variables and given/known data A proton with an initial velocity given by (4.0 + 3.0 + 3.0)(105 m/s) enters a magnetic field given by (0.62 T). Describe the motion of the proton. The proton will follow a helical path with a velocity of 3e5 m/s along the Z -axis, with the circular motion in the XY -plane having a speed of ?? and radius of ?? 3. The attempt at a solution so i got the velocity of the proton along Z axis but i'm not sure how to get the XY axis my idea was that i could just square x and y velocity then rad it but it didn't work and would i be able to get the Radius by using this formula?