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Chapter 20
A square conductor moves through a uniform
magnetic field. Which of the figures shows the
correct charge distribution on the conductor?
A square conductor moves through a uniform
magnetic field. Which of the figures shows the
correct charge distribution on the conductor?
Is there an induced current in this circuit? If so, what is its
direction?
A. Yes, clockwise
B. Yes, counterclockwise
C. No
Is there an induced current in this circuit? If so, what is its
direction?
A. Yes, clockwise
B. Yes, counterclockwise
C. No
A square loop of copper wire is
pulled through a region of
magnetic field. Rank in order,
from strongest to weakest, the
pulling forces F1 , F2 , F3 , and F4
that must be applied to keep
the loop moving at constant
speed.
A.
B.
C.
D.
E.
F2 = F4 > F1 = F3
F3 > F2 = F4 > F1
F3 > F4 > F2 > F1
F4 > F2 > F1 = F3
F4 > F3 > F2 > F1
A square loop of copper wire is
pulled through a region of
magnetic field. Rank in order,
from strongest to weakest, the
pulling forces F1 , F2 , F3 , and F4
that must be applied to keep
the loop moving at constant
speed.
A.
B.
C.
D.
E.
F2 = F4 > F1 = F3
F3 > F2 = F4 > F1
F3 > F4 > F2 > F1
F4 > F2 > F1 = F3
F4 > F3 > F2 > F1
A current-carrying wire is pulled away from a
conducting loop in the direction shown. As the
wire is moving, is there a cw current around the
loop, a ccw current or no current?
A. There is a clockwise current around the loop.
B. There is a counterclockwise current around the loop.
C. There is no current around the loop.
A current-carrying wire is pulled away from a
conducting loop in the direction shown. As the
wire is moving, is there a cw current around the
loop, a ccw current or no current?
A. There is a clockwise current around the loop.
B. There is a counterclockwise current around the loop.
C. There is no current around the loop.
A conducting loop is
halfway into a magnetic
field. Suppose the magnetic
field begins to increase
rapidly in strength. What
happens to the loop?
A. The loop is pushed upward, toward the top of the page.
B. The loop is pushed downward, toward the bottom of the
page.
C. The loop is pulled to the left, into the magnetic field.
D. The loop is pushed to the right, out of the magnetic field.
E. The tension is the wires increases but the loop does not
move.
A conducting loop is
halfway into a magnetic
field. Suppose the magnetic
field begins to increase
rapidly in strength. What
happens to the loop?
A. The loop is pushed upward, toward the top of the page.
B. The loop is pushed downward, toward the bottom of the
page.
C. The loop is pulled to the left, into the magnetic field.
D. The loop is pushed to the right, out of the magnetic field.
E. The tension is the wires increases but the loop does not
move.
The potential at a is higher than the potential at b.
Which of the following statements about the
inductor current I could be true?
A.
B.
C.
D.
E.
I flows from a to b and is steady.
I flows from a to b and is decreasing.
I flows from b to a and is steady.
I flows from b to a and is increasing.
I flows from a to b and is increasing.
The potential at a is higher than the potential at b.
Which of the following statements about the
inductor current I could be true?
A.
B.
C.
D.
E.
I flows from a to b and is steady.
I flows from a to b and is decreasing.
I flows from b to a and is steady.
I flows from b to a and is increasing.
I flows from a to b and is increasing.
What is the direction of
the net force on the
moving charge?
A. Into the page
B. Out of the page
C. Left
D. Right
E. Up and left at 45°
What is the direction of
the net force on the
moving charge?
A. Into the page
B. Out of the page
C. Left
D. Right
E. Up and left at 45°
Which diagram shows the
fields in frame S´?
Which diagram shows the
fields in frame S´?
The electric field in four identical capacitors is shown as
a function of time. Rank in order, from largest to
smallest, the magnetic field strength at the outer edge of
the capacitor at time T.
A.
B.
C.
D.
E.
Ba = Bb > Bc = Bd
Ba > Bb > Bc > Bd
Ba = Ba > Bc > Bd
Bc > Ba > Bd > Bb
Bd > Bc > Ba = Bb
The electric field in four identical capacitors is shown as
a function of time. Rank in order, from largest to
smallest, the magnetic field strength at the outer edge of
the capacitor at time T.
A.
B.
C.
D.
E.
Ba = Bb > Bc = Bd
Ba > Bb > Bc > Bd
Ba = Ba > Bc > Bd
Bc > Ba > Bd > Bb
Bd > Bc > Ba = Bb
An electromagnetic wave is
propagating in the positive
x-direction. At this instant of
time, what is the direction of
at the center of the rectangle?
A. In the positive x-direction
B. In the negative x-direction
C. In the positive y-direction
D. In the positive z-direction
E. In the negative z-direction
An electromagnetic wave is
propagating in the positive
x-direction. At this instant of
time, what is the direction of
at the center of the rectangle?
A. In the positive x-direction
B. In the negative x-direction
C. In the positive y-direction
D. In the positive z-direction
E. In the negative z-direction
An electromagnetic wave is
traveling in the positive
y-direction. The electric field
at one instant of time is
shown at one position. The
magnetic field at this
position points
A. In the positive x-direction.
B. In the negative x-direction.
C. In the positive y-direction.
D. In the negative y-direction.
E. Away from the origin.
An electromagnetic wave is
traveling in the positive
y-direction. The electric field
at one instant of time is
shown at one position. The
magnetic field at this
position points
A. In the positive x-direction.
B. In the negative x-direction.
C. In the positive y-direction.
D. In the negative y-direction.
E. Away from the origin.
Currents circulate in a piece of metal that is pulled through
a magnetic field. What are these currents called?
A. Induced currents
B. Displacement currents
C. Faraday’s currents
D. Eddy currents
E. This topic is not covered in Chapter 33.
Currents circulate in a piece of metal that is pulled through
a magnetic field. What are these currents called?
A. Induced currents
B. Displacement currents
C. Faraday’s currents
D. Eddy currents
E. This topic is not covered in Chapter 33.
Electromagnetic induction was discovered by
A. Faraday.
B. Henry.
C. Maxwell.
D. Both Faraday and Henry.
E. All three.
Electromagnetic induction was discovered by
A. Faraday.
B. Henry.
C. Maxwell.
D. Both Faraday and Henry.
E. All three.
The direction that an induced current flows
in a circuit is given by
A. Faraday’s law.
B. Lenz’s law.
C. Henry’s law.
D. Hertz’s law.
E. Maxwell’s law.
The direction that an induced current flows
in a circuit is given by
A. Faraday’s law.
B. Lenz’s law.
C. Henry’s law.
D. Hertz’s law.
E. Maxwell’s law.
The amplitude of the oscillating electric field at your cell
phone is 4.0 µV/m when you are 10 km east of the
broadcast antenna. What is the electric field amplitude
when you are 20 km east of the antenna?
A. 1.0 µV/m
B. 2.0 µV/m
C. 4.0 µV/m
D. There’s not enough information to tell.
The amplitude of the oscillating electric field at your cell
phone is 4.0 µV/m when you are 10 km east of the
broadcast antenna. What is the electric field amplitude
when you are 20 km east of the antenna?
A. 1.0 µV/m
B. 2.0 µV/m
C. 4.0 µV/m
D. There’s not enough information to tell.
Experimenter A creates a magnetic field in the laboratory.
Experimenter B moves relative to A. Experimenter B sees
A. just the same magnetic field.
B. a magnetic field of different strength.
C. a magnetic field pointing the opposite direction.
D. just an electric field.
E. both a magnetic and an electric field.
Experimenter A creates a magnetic field in the laboratory.
Experimenter B moves relative to A. Experimenter B sees
A. just the same magnetic field.
B. a magnetic field of different strength.
C. a magnetic field pointing the opposite direction.
D. just an electric field.
E. both a magnetic and an electric field.