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An electron is projected with an initial speed U0 = 1.60 X 106 m/s into the uniform field between the parallel plates in Fig. 21.38. Assume that the field between the plates is uniform and directed vertically downward, and that the field outside the plates is zero. The electron enters the field at a point midway between the plates.
(a) If the electron just misses the upper plate as it emerges from the field, find the magnitude of the electric field.
(b) Suppose that in Fig. 21.38 the electron is replaced by a proton with the same initial speed U0. Would the proton hit one of the plates? If the proton would not hit one of the plates, what would be the magnitude and direction of its vertical disp1acement as it exits the region between the plates?
(c) Compare the paths traveled by the electron and the proton and explain the differences.
(d) Discuss whether it is reasonable to ignore the effects of gravity for each particle.

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