Repeat part (a) of Problem 91, replacing the electron with a proton and reversing the di...

Repeat part (a) of Problem 91, replacing the electron with a proton and reversing the direction of the electric field. Compare your answer with the results obtained with an electron.

(reference problem 91)

An electron with an initial velocity of enters a parallel-plate capacitor at an angle of 40° through a small hole in the bottom plate as shown in Figure P17.91. (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 must have the positive charge? Assume there is a vacuum between the plates.