SAMPLE PROBLEM 32-1. A uniform magnetic field B, with magnitude 1.2 mT, points vertically upward throughout the volume of the room in which you are sitting (Fig. 32-7). A proton with a kinetic energy of 5.3 MeV moves horizontally to the north through a certain point in the room. What magnetic deflecting force acts on the proton as it passes through this point? The proton mass is 1.67 x 10-27 kg. on N on th Sun 88 E S FIGURE 32-7. Sample Problem 32-1. A view from above of a student sitting in a room in which a vertically upward magnetic field deflects a moving proton toward the east. (The dots, which represent the points of arrows, symbolize magnetic field vectors pointing out of the page.) / THE MAGNETIC FIELD The