12. DETAILS SERCP11 19.A.P.073.MI. MY NOTES ASK YOUR TEACHER Protons having a kinetic energy of 4.90 Mev are moving in the positive x-direction and enter a magnetic field of 0.0890 T in the z-direction, out of the plane of the page, and extending from x = 0 to x = 1.00 m as in the figure below. x = 1.00 m (a) Calculate the y-component of the protons' momentum as they leave the magnetic field. (Indicate the direction with the sign of your answer.) kg . m/s (b) Find the angle a between the initial velocity vector of the proton beam and the velocity vector after the beam emerges from the field. Hint: Neglect relativistic effects and note that 1 eV = 1.60 x 10-19 j. a =