A cathode ray tube is placed between the pieces of an electromagnet so that magnetic eld B, which is uniform along the length b of the beam and zero outside this length, is perpendicular to the cathode beam. Let c be the distance between the edge of the magnetic eld and the uorescent screen of the tube, V" the accelerating potential difference of the electrons, and 12/111 the specic charge of the electron: (SHOW YOUR WORK) a. Calculate the deviation 6 of the impact of the electrons on the screen. b. Simplify the expression obtained in the case where b is much smaller than the radius of the circular path of the electrons in the magnetic eld