1. A set of charges is assembled as shown in the below. The magnitude of the cha
ID: 1438321 • Letter: 1
Question
1. A set of charges is assembled as shown in the below. The magnitude of the charge q is 3 nc and a Scm. Assume that the potential at figure distance from the charge is zero. 3a 269.7 20 cm /2 0 cm 3S9.6 Find the potential, VP, at point P +87.6 CS oing to be positivt. -117V e. VP --231 V For the next two questions: an electron is placed at rest in the center of a three- dimensional region of space in which there is a uniform electric field. (A uniform field is one whose strength and direction are the same at all points in the region) There are no other forces in this problem besides the electric force. Points a, b, c, anddare simply names for points in space, there are no charges at those points! 2. When the electron is released from rest in the uniform E field, what will its subsequent motion be? A) It will remain at rest in its initial position. A B C L B) It will move at a constant velocity. C) It will move with a constant acceleration. DHwil move with a linearly changing acceleration E) It will move in a circle with constant speed.Explanation / Answer
q = 3 nC , a = 5 cm
r1 = 4a , r2 = 3a
r3 = (9a^2+16a^2)^1/2 = 5a
k =9*10^9 N.m^2/C^2
V =kq/r
V = V1 +V2 +V3
V = (kq/3a) -(kq/4a) +(kq/5a)
V = (9*10^9*3*10^-9)((1/3)-(1/4)+(1/5))/(0.05)
V =153 V
Correct option is (b)
2)
F =qE =ma
a = qE/m
in uniform electric filed it ill move with a constant acceleration.
Correct option is (C)
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