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In a cathode-ray tube, a beam of electrons (the cathode ray) is deflected in a region...

In a cathode-ray tube, a beam of electrons (the cathode ray) is deflected in a region of electric field on its way to a fluorescent screen, as shown in the figure. Consider the parallel-plate arrangement in the figure, and assume that the electric field E = 400 N/C is uniform between the plates and that E = 0outside the plates. The beam of electrons is injected horizontally with velocity v0 = 5.0 × 106 m/s. If the width of the plates is L = 4.0 cm, by what vertical distance y1 is the beam deflected upon just exiting the plates? If the distance from the end of the plates to the screen is D = 12.0 cm, what is the total vertical deflection y = y1 + y2 upon reaching the screen?

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