Protons having a kinetic energy of 5.00MeV are moving in the positive x-direction and enter a magnetic field of 0.050 0 T in the z-direction, out of the plane of the page, and extending from x = 0 to x = 1.00 m as in Figure.

(a) Calculate the y -component of the protons? momentum as they leave the magnetic field.

(b) Find the angle ? between the initial velocity vector of the proton beam and the velocity vector after the beam emerges from the field.