and direction of the resultant force on a point charge is -1.00 muC if it is Pla

Question

and direction of the resultant force on a point charge is -1.00 muC if it is Placed (a) at the center of the square, (b) at the vacant corner of the square? .. An electron is projected with an initial speed v0 = 5.00 times 106 m/s into the uniform field between the parallel plates in Figure 17.57. The direction of the field is vertically downward, and the field is zero except in the space between the two plates. The electron enters the field at a point midway Problem 70. between the plates. If the electron just misses the upper plate as it emerges from the field, find the magnitude of the electric field. FIGURE 17.57 .. A small 12.3 g plastic is tied to a very light 28.6 cm string that is attached to the vertical wall of a room. (See Figure 17.58.) A uniform horizontal electric field exists in this

Explanation / Answer

v = 5.00*106 m/s, L = 2.00 cm, d = 1.00 cm,

horizontal direction: L = vt, so t = L/v = 4.00*10-9 s

vertical direction: d/2 = at2/2, so

a = d/t2 = 6.25*1014 m/s2

F = qE = ma,

E = ma/q = 3.55*104 N/C

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