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Chapter 15
Electric Forces and
Electric Fields
Conceptual Quiz
Questions
Chapter 15: Electric Forces and Electric Fields
The diagram below shows the initial charge and position of
three metal spheres, X, Y, and Z, on insulating stands.
Sphere X is brought into contact with sphere Y and then
removed. Then sphere Y is brought into contact with sphere Z
and removed. What is the charge on sphere Z after this
procedure is completed?
(A) +1 x 10-6 C
(B) +3 x 10-6 C
(C) +2 x 10-6 C
(D) +4 x 10-6 C
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Ch15: Electric Charge and Electric Field (02 of 35)
Chapter 15: Electric Forces and Electric Fields
Gravitational field strength is to newtons per kilogram
as electric field strength is to
(A) coulombs per joule
(B) coulombs per newton
(C) joules per coulomb
(D) newtons per coulomb
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Ch15: Electric Charge and Electric Field (03 of 35)
Chapter 15: Electric Forces and Electric Fields
Two similar metal spheres possessing +1.0 coulomb of
charge and -1.0 coulomb of charge, respectively, are brought
toward each other. Which graph best represents the
relationship between the magnitude of the electric force
between the spheres and the distance between them?
(A)
(B)
(C)
(D)
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Ch15: Electric Charge and Electric Field (04 of 35)
Chapter 15: Electric Forces and Electric Fields
The diagram below shows two metal
spheres charged to +1.0 x 10-6 coulomb
and +3.0 x 10-6 coulomb, respectively, on
insulating stands. The spheres are touched
together and then returned to their original
positions. as a result, the magnitude of the
electrostatic force between the spheres changes from 3.0 N to
(A) 1.5 N
(B) 2.0 N
(C) 4.0 N
(D) 6.0 N
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Ch15: Electric Charge and Electric Field (05 of 35)
Chapter 15: Electric Forces and Electric Fields
Which diagram best represents the electric field around a
negatively charged conducting sphere?
(A)
(B)
(C)
(D)
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Ch15: Electric Charge and Electric Field (06 of 35)
Chapter 15: Electric Forces and Electric Fields
The diagram shows the arrangement of three
charged hollow metal spheres, A, B, and C.
The arrows indicate the direction of the
electric forces acting between the spheres.
At least two of the spheres are positively
charged. Which sphere, if any, could be
negatively charged?
(A) sphere A
(B) sphere B
(C) sphere C
(D) no sphere
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Ch15: Electric Charge and Electric Field (07 of 35)
Chapter 15: Electric Forces and Electric Fields
An electrostatic force of magnitude F exists between two
metal spheres having identical charge q. The distance
between their centers is r. Which combination of changes
would produce No change in the electrostatic force between
the spheres?
(A) doubling q on one sphere while doubling r
(B) doubling q on both spheres while doubling r
(C) doubling q on one sphere while halving r
(D) doubling q on both spheres while halving r
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Ch15: Electric Charge and Electric Field (08 of 35)
Chapter 15: Electric Forces and Electric Fields
The Millikan oil drop experiment determined
the smallest unit of
(A) mass
(B) weight
(C) electric charge
(D) electric field strength
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Ch15: Electric Charge and Electric Field (09 of 35)
Chapter 15: Electric Forces and Electric Fields
A glass rod is rubbed with a piece of silk. During the process
the glass rod acquires a positive charge and the silk
(A) acquires a positive charge also.
(B) acquires a negative charge.
(C) remains neutral.
(D) could either be positively charged or negatively charged.
It depends on how hard the rod was rubbed.
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Ch15: Electric Charge and Electric Field (10 of 35)
Chapter 15: Electric Forces and Electric Fields
Is it possible for a positive and a negative charge to attract
each other?
(A) Yes, they always attract.
(B) Yes, they will attract if they are close enough.
(C) Yes, they will attract if one carries a larger charge
than the other.
(D) No, they will never attract.
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Ch15: Electric Charge and Electric Field (11 of 35)
Chapter 15: Electric Forces and Electric Fields
A proton carries a
(A) positive charge.
(B) neutral charge.
(C) negative charge.
(D) variable charge.
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Ch15: Electric Charge and Electric Field (12 of 35)
Chapter 15: Electric Forces and Electric Fields
An atom has more electrons than protons. The atom is
(A) a positive ion.
(B) a negative ion.
(C) a superconductor.
(D) impossible.
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Ch15: Electric Charge and Electric Field (13 of 35)
Chapter 15: Electric Forces and Electric Fields
An originally neutral electroscope is briefly touched with a
positively charged glass rod. The electroscope
(A) remains neutral.
(B) becomes negatively charged.
(C) becomes positively charged.
(D) could become either positively or negatively charged,
depending on the time of contact.
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Ch15: Electric Charge and Electric Field (14 of 35)
Chapter 15: Electric Forces and Electric Fields
An originally neutral electroscope is grounded briefly while a
positively charged glass rod is held near it. After the glass rod
is removed, the electroscope
(A) remains neutral.
(B) is negatively charged.
(C) is positively charged.
(D) could be either positively or negatively charged, depending
on how long the contact with ground lasted.
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Ch15: Electric Charge and Electric Field (15 of 35)
Chapter 15: Electric Forces and Electric Fields
A large negatively charged object is placed on an insulated table.
A neutral metallic ball rolls straight toward the object, but stops
before it touches it. A second neutral metallic ball rolls along the
path followed by the first ball, strikes the first ball, and stops.
The first ball rolls forward, but does not touch the negative
object. At no time does either ball touch the negative object.
What is the final charge on each ball?
(A) The first ball is positive, and the second ball is negative.
(B) The first ball is negative, and the second ball is positive.
(C) Both balls remain neutral.
(D) Both balls are positive.
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Ch15: Electric Charge and Electric Field (16 of 35)
Chapter 15: Electric Forces and Electric Fields
Two charged objects are separated by a distance d. The first
charge is larger in magnitude than the second charge.
(A) The first charge exerts a larger force on the second charge.
(B) The second charge exerts a larger force on the first charge.
(C) The charges exert forces on each other equal in magnitude
and opposite in direction.
(D) The charges exert forces on each other equal in magnitude
and pointing in the same direction.
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Ch15: Electric Charge and Electric Field (17 of 35)
Chapter 15: Electric Forces and Electric Fields
Two charged objects attract each other with a certain force.
If the charges on both objects are doubled with no change in
separation, the force between them
Q1Q 2
Fk
r2
(A) quadruples.
(B) doubles.
(C) halves.
(D) increases, but we can't say how much without knowing
the distance between them.
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Ch15: Electric Charge and Electric Field (18 of 35)
Chapter 15: Electric Forces and Electric Fields
Two charged objects attract each other with a force F.
What happens to the force between them if one charge is
doubled, the other charge is tripled, and the separation
distance between their centers is reduced to one-fourth its
original value? The force is now equal to
(A) 16F.
Q1Q 2
Fk
r2
(B) 24F.
(C) (3/8)F.
(D) 96F.
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Ch15: Electric Charge and Electric Field (19 of 35)
Chapter 15: Electric Forces and Electric Fields
An electron and a proton are separated by a distance d.
What happens to the magnitude of the force on the proton
if a second electron is placed next to the first electron?
Q1Q 2
Fk
d2
(A) It quadruples.
(B) It doubles.
(C) It will not change.
Q1 2Q 2 
Fk
d2
(D) It goes to zero.
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Ch15: Electric Charge and Electric Field (20 of 35)
Chapter 15: Electric Forces and Electric Fields
An electron and a proton are separated by a distance d.
What happens to the magnitude of the force on the first
electron if a second electron is placed next to the proton?
Q1Q 2
Fk
d2
(A) It doubles.
(B) It does not change.
(C) It is reduced to half.
F  0
(D) It becomes zero.
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Ch15: Electric Charge and Electric Field (21 of 35)
Chapter 15: Electric Forces and Electric Fields
A point charge of +Q is placed at the center of a square.
When a second point charge of -Q is placed at one of the
square's corners, it is observed that an electrostatic force
of 2.0 N acts on the positive charge at the square's center.
Now, identical charges of -Q are placed at the other three
corners of the square. What is the magnitude of the net
electrostatic force acting on the positive charge at the
center of the square?
(A) zero
(B) 2.8 N
(C) 4.0 N
(D) 8.0 N
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Ch15: Electric Charge and Electric Field (22 of 35)
Chapter 15: Electric Forces and Electric Fields
A point charge of +Q is placed at the centroid of an
equilateral triangle. When a second charge of +Q is placed
at one of the triangle's vertices, an electrostatic force of 4.0 N
acts on it. What is the magnitude of the force that acts on the
center charge due to a third charge of +Q placed at
one of the other vertices?
(A) zero
(B) 4.0 N
(C) 8.0 N
(D) 16 N
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Ch15: Electric Charge and Electric Field (23 of 35)
Chapter 15: Electric Forces and Electric Fields
Which of the following is not a vector?
(A) electric force
(B) electric field
(C) electric charge
(D) electric line of force
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Ch15: Electric Charge and Electric Field (24 of 35)
Chapter 15: Electric Forces and Electric Fields
Is it possible to have a zero electric field value between a negative
and positive charge along the line joining the two charges?
(A) Yes, if the two charges are equal in magnitude.
(B) Yes, regardless of the magnitude of the two charges.
(C) No, a zero electric field cannot exist between the two charges.
(D) cannot be determined without knowing the separation
between the two charges
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Ch15: Electric Charge and Electric Field (25 of 35)
Chapter 15: Electric Forces and Electric Fields
Is it possible to have a zero electric field value between two
positive charges along the line joining the two charges?
(A) Yes, if the two charges are equal in magnitude.
(B) Yes, regardless of the magnitude of the two charges.
(C) No, a zero electric field cannot exist between the two charges.
(D) cannot be determined without knowing the separation
between the two charges
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Ch15: Electric Charge and Electric Field (26 of 35)
Chapter 15: Electric Forces and Electric Fields
Can electric field lines intersect in free space?
(A) Yes, but only at the midpoint between two equal
like charges.
(B) Yes, but only at the midpoint between a positive
and a negative charge.
(C) Yes, but only at the centroid of an equilateral
triangle with like charges at each corner.
(D) No.
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Ch15: Electric Charge and Electric Field (27 of 35)
Chapter 15: Electric Forces and Electric Fields
If a solid metal sphere and a hollow metal sphere of equal
diameters are each given the same charge, the electric field E
midway between the center and the surface is
(A) greater for the solid sphere than for the hollow sphere.
(B) greater for the hollow sphere than for the solid sphere.
(C) zero for both.
(D) equal in magnitude for both, but one is opposite in
direction from the other.
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Ch15: Electric Charge and Electric Field (28 of 35)
Chapter 15: Electric Forces and Electric Fields
The model of the atom shows a
(A) neutrally charged nucleus surrounded by both
protons and electrons.
(B) nucleus consisting of both protons and electrons,
surrounded by a cloud of neutrons
(C) nucleus consisting of both electrons and neutrons,
surrounded by a cloud of protons.
(D) nucleus consisting of both protons and neutrons,
surrounded by a cloud of electrons.
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Ch15: Electric Charge and Electric Field (29 of 35)
Chapter 15: Electric Forces and Electric Fields
Materials in which the electrons are bound very tightly to
the nuclei are referred to as
(A) insulators.
(B) conductors.
(C) semiconductors.
(D) superconductors.
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Ch15: Electric Charge and Electric Field (30 of 35)
Chapter 15: Electric Forces and Electric Fields
Sphere A carries a net positive charge, and sphere B is
neutral. They are placed near each other on an insulated
table. Sphere B is briefly touched with a wire that is
grounded. Which statement is correct?
(A) Sphere B remains neutral.
(B) Sphere B is now positively charged.
(C) Sphere B is now negatively charged.
(D) The charge on sphere B cannot be determined without
additional information.
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Ch15: Electric Charge and Electric Field (31 of 35)
Chapter 15: Electric Forces and Electric Fields
A positive object touches a neutral electroscope, and the
leaves separate. Then a negative object is brought near the
electroscope, but does not touch it. What happens to the
leaves?
(A) They separate further.
(B) They move closer together.
(C) They are unaffected.
(D) cannot be determined without further information
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Ch15: Electric Charge and Electric Field (32 of 35)
Chapter 15: Electric Forces and Electric Fields
Sphere A carries a net charge and sphere B is neutral. They
are placed near each other on an insulated table. Which
statement best describes the electrostatic force between them?
(A) There is no force between them since one is neutral.
(B) There is a force of repulsion between them.
(C) There is a force of attraction between them.
(D) The force is attractive if A is charged positively and
repulsive if A is charged negatively.
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Ch15: Electric Charge and Electric Field (33 of 35)
Chapter 15: Electric Forces and Electric Fields
An electron and a proton are separated by a distance
of 1.0 m. What happens to the size of the force on the
proton if the electron is moved 0.50 m closer to the
proton?
(A) It increases to 4 times its original value.
(B) It increases to 2 times its original value.
(C) It decreases to one-half its original value.
(D) It decreases to one-fourth its original value.
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Ch15: Electric Charge and Electric Field (34 of 35)
Chapter 15: Electric Charge and Field
A
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Chapter 15: Electric Charge and Field
B
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Chapter 15: Electric Charge and Field
C
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Chapter 15: Electric Charge and Field
D
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