An electron with an initial velocity of 3.1 ×106 m/s enters a parallel-plate capacitor at an angle of 40° through a small hole in the bottom plate as shown in Figure P17.87. (a) If the plates are separated by a distance d =2.4 cm, what minimum electric field must be present to prevent the electron from hitting the top plate? (b) Which plate has to have the positive charge? Assume there is a vacuum between the plates.
Figure P17.87
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