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Protons which have a kinetic energy of 0.4 MeV move in the +5: direction. They enter a region of uniform magnetic eld pointing into the plane of the page with a magnitude of B = 0.01 T. The region extends from x = 0 to x = 0.75 m. a} Determine the v component of a proton's momentum as it exits the magnetic eld region. b} Find the angle between the initial velocitv vector as the protons enter the eld and the nal velocity vector as the protons exit the eld region