College Physics
OER 2016 Edition
ISBN: 9781947172173
Author: OpenStax
Publisher: OpenStax College
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Textbook Question
Chapter 18, Problem 47PE
(a) Sketch the electric field lines near a point charge +q (b) Do the same for a point charge +q. (b) Do the same for a point charge −3.00q.
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Students have asked these similar questions
(a) Sketch the electric field lines around an isolated point charge q > 0. (b) Sketch the electric field pattern around an isolated negative point charge of magnitude -2q.
Problem 5: A thin rod of length L = 1.9 m lies along the positive y-axis
with one end at the origin. The rod carries a uniformly distributed
charge of Q1 = 5.2 µC. A point charge Q2 = 10.4 uC is located on the
positive x-axis a distance a = 0.45 m from the origin. Refer to the figure.
dy
y
X
a
Part (a) Consider a thin slice of the rod of thickness dy located a distance y away from the origin. What is the direction of
the force on the point charge due to the charge on this thin slice?
MultipleChoice :
1) Along the positive x-axis
2) Above the negative x-axis
3) Below the positive x-axis
4) Not enough information to determine
5) There is no force between the point charge and the slice of the rod
6) Above the positive x-axis
7) Below the negative x-axis
Part (b) Choose the correct equation for x-component of the force, dFx, on the point charge due to the thin slice of the rod.
SchematicChoice :
kQ1Q2ady
Q1Q2ady
kQ,Q2ady dF
dF, =
L(a² + y²)
dFx
3
3
L(a² + y²)ž
L(a² + y²)ž
kQ1Q2ydy
kQ,Qzydy…
A charge +q is located at the origin. A charge - 2q is at 3.15 m on the x axis.
(a) For what finite value of x is the electric field zero?
7
Xm
To the right of both charges, which charge is always closest? Does it have the smaller or larger
charge? At what locations are there two field contributions that can cancel to produce zero net
field?
(b) For what finite value(s) of x is the electric potential zero?
x m
Because the charge of -2q is closer than the charge of +q for this value of x,
the 2q dominates and the total field cannot be zero.
m
smaller value
larger value
Chapter 18 Solutions
College Physics
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