
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Transcribed Image Text:Practice calculating net fields due to point sources: Four charges are placed at the vertices of a
rectangle of sides length a and 2a as shown.
9₁
92
93
2a
a
The magnitudes of the charges are multiples of some positive charge q as follows:
91 = +q
92 = -2g
93 = +2q
94 = -9
(a) Draw the electric field vector diagram for the field seen by the q2 charge at the upper right
corner. We will focus on this charge as the test charge, which sees the rest of the charges as
sources.
(b) Use the diagram to find the magnitude and components of each of the electric fields created at
the test point (q2's location) by the individual point sources (the other charges.) Your answers
will be in terms of the unknown quantities a and q. From these, find the net electric field (in
terms of a and q) at the upper right corner.
(c) Using the field you just calculated, find, again in terms of a and q, the magnitude of the electric
force on 92.
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