Cutnell/Johnson Physics 7th edition

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Cutnell/JohnsonPhysics 7th edition

• Classroom Response System Questions

Chapter 32 Maxwells Equations Magnetism of
Matter
Reading Quiz Questions
2
32.2.1. Complete the following statement
According to todays scientists, magnetic
monopoles a) have no mass. b) have no
charge. c) are found in abundance in the most
distant parts of the universe. d) do not exist
anywhere in the universe. e) are the
antiparticles for magnetic dipoles.
3
32.2.1. Complete the following statement
According to todays scientists, magnetic
monopoles a) have no mass. b) have no
charge. c) are found in abundance in the most
distant parts of the universe. d) do not exist
anywhere in the universe. e) are the
antiparticles for magnetic dipoles.
4
32.2.2. What would you get if you took a bar
magnet and cut it in half? a) two pieces, one a
north pole and one a south pole b) two shorter
magnets, each with a north pole and a south
pole c) two pieces, both non-magnetic d) a
molten mess from the energy released from within
the magnet upon cutting e) an electric shock
5
32.2.2. What would you get if you took a bar
magnet and cut it in half? a) two pieces, one a
north pole and one a south pole b) two shorter
magnets, each with a north pole and a south
pole c) two pieces, both non-magnetic d) a
molten mess from the energy released from within
the magnet upon cutting e) an electric shock
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32.2.3. Which of the following choices concerning
the net magnetic flux through any enclosed
surface is true according to Gauss law for
magnetic fields? a) The net magnetic flux in
this case would be a vector quantity equal to the
enclosed magnetic field. b) The net magnetic
flux in this case would be a vector quantity
equal to the number of magnetic monopoles passing
through the surface per unit time. c) The net
magnetic flux in this case would be a positive
scalar quantity. d) The net magnetic flux in
this case would be equal to zero. e) The net
magnetic flux in this case would be a negative
scalar quantity.
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32.2.3. Which of the following choices concerning
the net magnetic flux through any enclosed
surface is true according to Gauss law for
magnetic fields? a) The net magnetic flux in
this case would be a vector quantity equal to the
enclosed magnetic field. b) The net magnetic
flux in this case would be a vector quantity
equal to the number of magnetic monopoles passing
through the surface per unit time. c) The net
magnetic flux in this case would be a positive
scalar quantity. d) The net magnetic flux in
this case would be equal to zero. e) The net
magnetic flux in this case would be a negative
scalar quantity.
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32.3.1. What is produced from a changing electric
field? a) an electric field directed
perpendicularly to the changing field b) a
magnetic flux c) a magnetic field directed
perpendicularly to the changing field d)
lightning e) an electric field directed
parallel to the changing field
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32.3.1. What is produced from a changing electric
field? a) an electric field directed
perpendicularly to the changing field b) a
magnetic flux c) a magnetic field directed
perpendicularly to the changing field d)
lightning e) an electric field directed
parallel to the changing field
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32.3.2. A parallel plate capacitor is being
charged by a constant current i. During the
charging, the electric field within the plates is
increasing with time. Which one of the following
statements concerning the magnetic field between
the plates is true? a) The magnetic field
within a parallel plate capacitor is always equal
to zero tesla. b) The induced magnetic field is
directed antiparallel to the increasing electric
field. c) The induced magnetic field strength
has its largest value at the center of the plates
and decreases linearly toward the edges of the
plates. d) The induced magnetic field strength
has the same magnitude within the plates of the
capacitor, except near the edges, at a given
time. e) The induced magnetic field strength is
zero tesla near the center of the plates and
increases as r increases toward the edges of the
plates.
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32.3.2. A parallel plate capacitor is being
charged by a constant current i. During the
charging, the electric field within the plates is
increasing with time. Which one of the following
statements concerning the magnetic field between
the plates is true? a) The magnetic field
within a parallel plate capacitor is always equal
to zero tesla. b) The induced magnetic field is
directed antiparallel to the increasing electric
field. c) The induced magnetic field strength
has its largest value at the center of the plates
and decreases linearly toward the edges of the
plates. d) The induced magnetic field strength
has the same magnitude within the plates of the
capacitor, except near the edges, at a given
time. e) The induced magnetic field strength is
zero tesla near the center of the plates and
increases as r increases toward the edges of the
plates.
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32.4.1. What is a displacement current? a) a
fictitious current across the plates of a
capacitor b) charged particles moving in a
changing magnetic field c) charged particle
moving in a changing electric field d) the
movement of the positive nuclei within atoms in
response to a changing electric field e) the
movement of the positive nuclei within atoms in
response to a changing magnetic field
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32.4.1. What is a displacement current? a) a
fictitious current across the plates of a
capacitor b) charged particles moving in a
changing magnetic field c) charged particle
moving in a changing electric field d) the
movement of the positive nuclei within atoms in
response to a changing electric field e) the
movement of the positive nuclei within atoms in
response to a changing magnetic field
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32.4.2. By making use of the concept of
displacement current, we can find the induced
magnetic field strength within a charging
capacitor. Consider a parallel plate capacitor
with circular plates of radius R. Which of the
following expressions gives the correct
relationship between the induced magnetic field
strength B at radius r from the
center? a) b) c) B constant d) e)
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32.4.2. By making use of the concept of
displacement current, we can find the induced
magnetic field strength within a charging
capacitor. Consider a parallel plate capacitor
with circular plates of radius R. Which of the
following expressions gives the correct
relationship between the induced magnetic field
strength B at radius r from the
center? a) b) c) B constant d) e)
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32.5.1. Which one of the following is not one of
Maxwells fundamental equations of
electromagnetism? a) Gauss law for
electricity b) Coulombs law c) Faradays
law d) Ampere-Maxwell law e) Gauss law for
magnetism
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32.5.1. Which one of the following is not one of
Maxwells fundamental equations of
electromagnetism? a) Gauss law for
electricity b) Coulombs law c) Faradays
law d) Ampere-Maxwell law e) Gauss law for
magnetism
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32.6.1. Which one of the following choices is the
generally accepted reason for the changing of the
Earths magnetic field over time? a) The field
has changed because the Hubble constant has
changed. b) The field has changed as the Earth
has gone through numerous global warming and
cooling cycles. c) The field has changed as the
Earths rotation has slowed down over time. d)
The field has changed as a result of numerous
asteroid collisions with the Earth over time. e)
The reason for the changing field has yet to be
determined.
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32.6.1. Which one of the following choices is the
generally accepted reason for the changing of the
Earths magnetic field over time? a) The field
has changed because the Hubble constant has
changed. b) The field has changed as the Earth
has gone through numerous global warming and
cooling cycles. c) The field has changed as the
Earths rotation has slowed down over time. d)
The field has changed as a result of numerous
asteroid collisions with the Earth over time. e)
The reason for the changing field has yet to be
determined.
20
32.6.2. The direction of the magnetic field at
any location of the Earths surface is commonly
specified in terms of two field angles. What are
the names given to these two angles? a)
latitude and longitude b) oblique and
obtuse c) dihedral and euclidean d) squine
and novile e) declination and inclination
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32.6.2. The direction of the magnetic field at
any location of the Earths surface is commonly
specified in terms of two field angles. What are
the names given to these two angles? a)
latitude and longitude b) oblique and
obtuse c) dihedral and euclidean d) squine
and novile e) declination and inclination
22
32.6.3. What are the stones called that were
initially discovered by the ancient Greek and
Chinese peoples that are naturally occurring
magnetic materials? a) pyrite b)
lodestones c) compass stones d) sorcerer
stone e) hematite
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32.6.3. What are the stones called that were
initially discovered by the ancient Greek and
Chinese peoples that are naturally occurring
magnetic materials? a) pyrite b)
lodestones c) compass stones d) sorcerer
stone e) hematite
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32.7.1. Which of the following is most
responsible for the magnetic behavior of
materials? a) neutrons b) protons c)
photons d) electrons e) phonons
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32.7.1. Which of the following is most
responsible for the magnetic behavior of
materials? a) neutrons b) protons c)
photons d) electrons e) phonons
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32.7.2. Which one of the following statements
concerning the measured values of the spin
angular momentum is true? a) The measured
component of the spin angular momentum can only
have one of two possible values that differ only
in the sign. b) The spin angular momentum can
be oriented only in the direction an electron is
moving. c) The spin angular momentum can be
easily measured in todays laboratories. d) The
spin angular momentum is the same thing as
angular momentum, except that it is the angular
momentum of an electron. e) The spin angular
momentum does not contribute to the magnetic
properties of materials.
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32.7.2. Which one of the following statements
concerning the measured values of the spin
angular momentum is true? a) The measured
component of the spin angular momentum can only
have one of two possible values that differ only
in the sign. b) The spin angular momentum can
be oriented only in the direction an electron is
moving. c) The spin angular momentum can be
easily measured in todays laboratories. d) The
spin angular momentum is the same thing as
angular momentum, except that it is the angular
momentum of an electron. e) The spin angular
momentum does not contribute to the magnetic
properties of materials.
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32.8.1. Which one of the following statements is
true for paramagnetic materials? a) The atoms
have no permanent magnetic dipole moments under
any condition. b) The atoms have permanent
magnetic dipole moments that are mostly aligned
with each other. c) The atoms have permanent
magnetic dipole moments that are randomly
oriented. d) The atoms have permanent magnetic
dipole moments that are aligned either parallel
or antiparallel with each other. e) The atoms
have dipole moments that align in opposition to
an applied magnetic field, but otherwise have no
permanent dipole moments.
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32.8.1. Which one of the following statements is
true for paramagnetic materials? a) The atoms
have no permanent magnetic dipole moments under
any condition. b) The atoms have permanent
magnetic dipole moments that are mostly aligned
with each other. c) The atoms have permanent
magnetic dipole moments that are randomly
oriented. d) The atoms have permanent magnetic
dipole moments that are aligned either parallel
or antiparallel with each other. e) The atoms
have dipole moments that align in opposition to
an applied magnetic field, but otherwise have no
permanent dipole moments.
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32.8.2. Which of the following terms is used to
describe materials that have regions in which
strong magnetic dipole moments are aligned with
each other? a) diamagnetic b)
paramagnetic c) ferromagnetic d)
ferrimagnetic e) gaussetic
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32.8.2. Which of the following terms is used to
describe materials that have regions in which
strong magnetic dipole moments are aligned with
each other? a) diamagnetic b)
paramagnetic c) ferromagnetic d)
ferrimagnetic e) gaussetic
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32.8.3. What produces the magnetism of an
individual atom? a) the nuclear force that
holds protons within the atomic nucleus b) the
orbital and spin motions of electrons c) the
motion of the atom itself d) the electric
interaction between electrons and protons e)
neutrons are naturally magnetic
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32.8.3. What produces the magnetism of an
individual atom? a) the nuclear force that
holds protons within the atomic nucleus b) the
orbital and spin motions of electrons c) the
motion of the atom itself d) the electric
interaction between electrons and protons e)
neutrons are naturally magnetic
34
32.9.1. Which of the following terms is used to
describe materials that have weak induced
magnetic dipole moments that are directed in the
opposite direction to an applied external
magnetic field? a) diamagnetic b)
paramagnetic c) ferromagnetic d)
ferrimagnetic e) gaussetic
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32.9.1. Which of the following terms is used to
describe materials that have weak induced
magnetic dipole moments that are directed in the
opposite direction to an applied external
magnetic field? a) diamagnetic b)
paramagnetic c) ferromagnetic d)
ferrimagnetic e) gaussetic
36
32.11.1. What is the name given to the quantum
mechanical effect that gives rise to
ferromagnetism in materials, such as iron,
cobalt, and nickel? a) parity b) nuclear
magnetic resonance c) cooper pairing d)
quantization e) exchange coupling
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32.11.1. What is the name given to the quantum
mechanical effect that gives rise to
ferromagnetism in materials, such as iron,
cobalt, and nickel? a) parity b) nuclear
magnetic resonance c) cooper pairing d)
quantization e) exchange coupling
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32.11.2. Which one of the following materials is
not ferromagnetic? a) cobalt b) nickel c)
gadolinium d) iron e) aluminum
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32.11.2. Which one of the following materials is
not ferromagnetic? a) cobalt b) nickel c)
gadolinium d) iron e) aluminum