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Conceptual Integrated Science—Chapter 7
Which of these particles has an electrical charge?
A.
B.
C.
D.
Proton.
Electron.
Ion.
All of the above.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
Which of these particles has an electrical charge?
A.
B.
C.
D.
Proton.
Electron.
Ion.
All of the above.
Explanation:
An ion, by definition, is a charged atom—one with an extra
electron(s) or deficient in one or more electrons.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
Which is the predominant carrier of charge in copper wire?
A.
B.
C.
D.
Proton.
Electron.
Ion.
All of the above.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
Which is the predominant carrier of charge in copper wire?
A.
B.
C.
D.
Proton.
Electron.
Ion.
All of the above.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
If a neutral atom has 22 protons in its nucleus, the number
of surrounding electrons is
A.
B.
C.
D.
less than 22.
22.
more than 22.
sometimes all of the above in a neutral atom.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
If a neutral atom has 22 protons in its nucleus, the number
of surrounding electrons is
A.
B.
C.
D.
less than 22.
22.
more than 22.
sometimes all of the above in a neutral atom.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
When we say charge is conserved, we mean that charge
can
A.
B.
C.
D.
be saved, like money in a bank.
only be transferred from one place to another.
take equivalent forms.
be created or destroyed, as in nuclear reactions.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
When we say charge is conserved, we mean that charge
can
A.
B.
C.
D.
be saved, like money in a bank.
only be transferred from one place to another.
take equivalent forms.
be created or destroyed, as in nuclear reactions.
Explanation:
Electric charge cannot be created or destroyed. It can only be
transferred.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
According to Coulomb’s law, a pair of particles that are
placed twice as close to each other will experience forces
that are
A.
B.
C.
D.
twice as strong.
four times as strong.
half as strong.
one-quarter as strong.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
According to Coulomb’s law, a pair of particles that are
placed twice as close to each other will experience forces
that are
A.
B.
C.
D.
twice as strong.
four times as strong.
half as strong.
one-quarter as strong.
Explanation:
Coulomb’s law is an inverse-square law.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
According to Coulomb’s law, doubling both charges of a
pair of particles will result in a force between them that is
A.
B.
C.
D.
twice as strong.
four times as strong.
half as strong.
one-quarter as strong.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
According to Coulomb’s law, doubling both charges of a
pair of particles will result in a force between them that is
A.
B.
C.
D.
twice as strong.
four times as strong.
half as strong.
one-quarter as strong.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
When a negatively charged balloon is placed against a
nonconducting wall, negative charges in the wall are
A.
B.
C.
D.
attracted to the balloon.
repelled from the balloon.
too bound to positive charges in the wall to have any effect.
neutralized.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
When a negatively charged balloon is placed against a
nonconducting wall, negative charges in the wall are
A.
B.
C.
D.
attracted to the balloon.
repelled from the balloon.
too bound to positive charges in the wall to have
any effect.
neutralized.
Explanation:
The negative balloon repels negative charge in the
wall and attracts positive charge. Charges of atoms
and molecules are therefore nudged apart. This
condition of charge separation is called polarization.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
The strength of an electric field is measured by the force
A.
B.
C.
D.
exerted on a charge in the field.
between electric field lines.
between oppositely charged parallel plates.
all of the above.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
The strength of an electric field is measured by the force
A.
B.
C.
D.
exerted on a charge in the field.
between electric field lines.
between oppositely charged parallel plates.
all of the above.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
The direction of an electric field, by convention, is the
direction of force that the field would exert on
A.
B.
C.
D.
an electron.
a proton.
an atom.
all of the above.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
The direction of an electric field, by convention, is the
direction of force that the field would exert on
A.
B.
C.
D.
an electron.
a proton.
an atom.
all of the above.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
When you do work on an electrically charged particle, you
change the particle’s
A.
B.
C.
D.
charge.
potential energy.
capacitance.
power.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
When you do work on an electrically charged particle, you
change the particle’s
A.
B.
C.
D.
charge.
potential energy.
capacitance.
power.
Comment:
Recall the work–energy theorem in Chapter 3.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
When you increase the potential energy of a charged
particle, you increase its ability to
A.
B.
C.
D.
do work.
charge other particles.
conduct.
transform to heat.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
When you increase the potential energy of a charged
particle, you increase its ability to
A.
B.
C.
D.
do work.
charge other particles.
conduct.
transform to heat.
Comment:
Recall from Chapter 3 that the potential energy acquired by
something equals the work done on it.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
Electric potential, measured in volts, is a ratio of
A.
B.
C.
D.
charge to the square of the separation distance.
current to resistance.
energy to charge.
power to current.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
Electric potential, measured in volts, is a ratio of
A.
B.
C.
D.
charge to the square of the separation distance.
current to resistance.
energy to charge.
power to current.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
A party balloon may be charged to thousands of volts. The
charged balloon isn’t dangerous because it carries
relatively little
A.
B.
C.
D.
current.
energy.
capacitance.
resistance.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
A party balloon may be charged to thousands of volts. The
charged balloon isn’t dangerous because it carries
relatively little
A.
B.
C.
D.
current.
energy.
capacitance.
resistance.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
A coulomb of charge that passes through a 12-volt battery
is given
A.
B.
C.
D.
12 joules.
12 amperes.
12 ohms.
12 watts.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
A coulomb of charge that passes through a 12-volt battery
is given
A.
B.
C.
D.
12 joules.
12 amperes.
12 ohms.
12 watts.
Explanation:
Voltage = energy/charge; (12 V)/(1 C) = 12 J/C.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
Which statement is correct?
A.
B.
C.
D.
Voltage flows in a circuit.
Charge flows in a circuit.
Current causes voltage.
All the above are correct.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
Which statement is correct?
A.
B.
C.
D.
Voltage flows in a circuit.
Charge flows in a circuit.
Current causes voltage.
All of the above are correct.
Explanation:
Voltage is established across a circuit, not through it. Also,
voltage causes current, and not the other way around.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
A 10-ohm resistor carries 10 amperes. The voltage across
the resistor is
A.
B.
C.
D.
zero.
more than zero but less than 10 V.
10 V.
more than 10 V.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
A 10-ohm resistor carries 10 amperes. The voltage across
the resistor is
A.
B.
C.
D.
zero.
more than zero but less than 10 V.
10 V.
more than 10 V.
Explanation:
The voltage, in accord with Ohm’s law, is 100 V, much greater
than 10 V.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
A 10-ohm resistor is connected to a 120-volt power supply.
The current in the resistor is
A.
B.
C.
D.
1 A.
10 A.
12 A.
120 A.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
A 10-ohm resistor is connected to a 120-volt power supply.
The current in the resistor is
A.
B.
C.
D.
1 A.
10 A.
12 A.
120 A.
Explanation:
By Ohm’s law, current = voltage/resistance = 120 V/10 ohm =
12 A.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
A major difference between DC and AC in circuits is the
A.
B.
C.
D.
voltage associated with each.
timing associated with each.
way charges flow.
way circuits are wired.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
A major difference between DC and AC in circuits is the
A.
B.
C.
D.
voltage associated with each.
timing associated with each.
way charges flow.
way circuits are wired.
Explanation:
In a DC circuit, charge flows in one direction; in AC, charge flows
to and fro, alternating direction.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
A 120-volt line carries 20 amperes. The power expended is
A.
B.
C.
D.
6 watts.
20 watts.
120 watts.
2400 watts.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
A 120-volt line carries 20 amperes. The power expended is
A.
B.
C.
D.
6 watts.
20 watts.
120 watts.
2400 watts.
Explanation:
Power = voltage  current.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
How much current is in a 120-volt line at 1200 watts?
A.
B.
C.
D.
6 amperes.
10 amperes.
120 amperes.
240 amperes.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
How much current is in a 120-volt line at 1200 watts?
A.
B.
C.
D.
6 amperes.
10 amperes.
120 amperes.
240 amperes.
Explanation:
From Power = voltage  current, current = power/voltage =
1200 W/120 V = 10 A.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
What is the power rating of a lamp connected to a 12-V
source when it carries 1.5 A?
A.
B.
C.
D.
8 W.
12 W.
18 W.
None of the above.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
What is the power rating of a lamp connected to a 12-V
source when it carries 1.5 A?
A.
B.
C.
D.
8 W.
12 W.
18 W.
None of the above.
Explanation:
Power = voltage  current = 12 V  1.5 A = 18 W.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
Iron paper clips are strongly attracted to
A.
B.
C.
D.
the north pole of a magnet.
the south pole of a magnet.
either the north or south pole of a magnet.
none of the above.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
Iron paper clips are strongly attracted to
A.
B.
C.
D.
the north pole of a magnet.
the south pole of a magnet.
either the north or south pole of a magnet.
none of the above.
Explanation:
Magnetic domains in the clips are induced into alignment in much
the same way that electric charges are induced when polarized.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
Moving electric charged particles can interact with
A.
B.
C.
D.
an electric field.
a magnetic field.
both of the above.
neither of the above.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
Moving electric charged particles can interact with
A.
B.
C.
D.
an electric field.
a magnetic field.
both of the above.
neither of the above.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
When a magnetized compass is placed in a magnetic field,
it aligns with the field because of
A.
B.
C.
D.
attracting forces between the compass and the field.
torques on the magnet.
magnetic domains in the compass needle.
all of the above.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
When a magnetized compass is placed in a magnetic field,
it aligns with the field because of
A.
B.
C.
D.
attracting forces between the compass and the field.
torques on the magnet.
magnetic domains in the compass needle.
all of the above.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
Surrounding moving electric charges are
A.
B.
C.
D.
electric fields.
magnetic fields.
both of the above.
neither of the above.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
Surrounding moving electric charges are
A.
B.
C.
D.
electric fields.
magnetic fields.
both of the above.
neither of the above.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
A magnetic force cannot act on an electron when it
A.
B.
C.
D.
is at rest.
moves parallel to magnetic field lines.
both of the above.
neither of the above.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
A magnetic force cannot act on an electron when it
A.
B.
C.
D.
is at rest.
moves parallel to magnetic field lines.
both of the above.
neither of the above.
Explanation:
A force is exerted on charged particles only when they move at an
angle to magnetic field lines. The force is greatest when motion is
at right angles to the magnetic field, and it is zero when motion is
parallel to the field.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
The fact that a force is exerted on a current-carrying wire in
a magnetic field underlies
A.
B.
C.
D.
motors.
electric meters.
both of the above.
neither of the above.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
The fact that a force is exerted on a current-carrying wire in
a magnetic field underlies
A.
B.
C.
D.
motors.
electric meters.
both of the above.
neither of the above.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
A motor and a generator are
A.
B.
C.
D.
similar devices.
very different devices with different applications.
forms of transformers.
energy sources.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
A motor and a generator are
A.
B.
C.
D.
similar devices.
very different devices with different applications.
forms of transformers.
energy sources.
Explanation:
The main difference in a motor and generator is energy input and
output, which are opposite for each.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
A voltage will be induced in a wire loop when the magnetic
field within that loop
A.
B.
C.
D.
changes.
aligns with the electric field.
is at right angles to the electric field.
converts to magnetic energy.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
A voltage will be induced in a wire loop when the magnetic
field within that loop
A.
B.
C.
D.
changes.
aligns with the electric field.
is at right angles to the electric field.
converts to magnetic energy.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
An electric field is induced in any region of space in which
A.
B.
C.
D.
a magnetic field changes with time.
a magnetic field’s orientation is at right angles to the electric field.
the accompanying electric field undergoes changes in time.
all of the above.
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley
Conceptual Integrated Science—Chapter 7
An electric field is induced in any region of space in which
A.
B.
C.
D.
a magnetic field changes with time.
a magnetic field’s orientation is at right angles to the electric field.
the accompanying electric field undergoes changes in time.
all of the above.
Comment:
Quite wonderfully, changing electric and magnetic fields produce
light!
Copyright © 2007 Pearson Education, Inc., publishing as Pearson Addison-Wesley