Transcript up11_educue_ch29

Q29.1
A circular loop of wire is in a
region of spatially uniform
magnetic field. The magnetic
field is directed into the plane of
the figure.
If the magnetic field magnitude
is constant,
1. the induced emf is clockwise
2. the induced emf is counterclockwise
3. the induced emf is zero
4. answer depends on how strong the field is
A29.1
A circular loop of wire is in a
region of spatially uniform
magnetic field. The magnetic
field is directed into the plane of
the figure.
If the magnetic field magnitude
is constant,
1. the induced emf is clockwise
2. the induced emf is counterclockwise
3. the induced emf is zero
4. answer depends on how strong the field is
Q29.2
A circular loop of wire is in a
region of spatially uniform
magnetic field. The magnetic
field is directed into the plane of
the figure.
If the magnetic field magnitude
is decreasing,
1. the induced emf is clockwise
2. the induced emf is counterclockwise
3. the induced emf is zero
4. answer depends on the rate of change of the field
A29.2
A circular loop of wire is in a
region of spatially uniform
magnetic field. The magnetic
field is directed into the plane of
the figure.
If the magnetic field magnitude
is decreasing,
1. the induced emf is clockwise
2. the induced emf is counterclockwise
3. the induced emf is zero
4. answer depends on the rate of change of the field
Q29.3
A flexible loop of wire lies in
a uniform magnetic field of
magnitude B directed into the
plane of the picture. The loop
is pulled as shown by the
arrows, forming a loop of zero
area and inducing a current.
What statement about the induced current in the resistor R is correct?
1. current flows downward through R and is proportional to B
2. current flows upward through R and is proportional to B
3. current flows downward through R and is proportional to B2
4. current flows upward through R and is proportional to B2
5. none of the above
A29.3
A flexible loop of wire lies in
a uniform magnetic field of
magnitude B directed into the
plane of the picture. The loop
is pulled as shown by the
arrows, forming a loop of zero
area and inducing a current.
What statement about the induced current in the resistor R is correct?
1. current flows downward through R and is proportional to B
2. current flows upward through R and is proportional to B
3. current flows downward through R and is proportional to B2
4. current flows upward through R and is proportional to B2
5. none of the above
Q29.4
The rectangular loop of wire is being
moved to the right at constant
velocity. A constant current I flows
in the long wire in the direction
shown.
Which of the following statements
about the current induced in the loop
is correct?
1. the induced current is clockwise and proportional to I
2. the induced current is counterclockwise and proportional to I
3. the induced current is clockwise and proportional to I2
4. the induced current is counterclockwise and proportional to I2
5. there is no induced current
A29.4
The rectangular loop of wire is being
moved to the right at constant
velocity. A constant current I flows
in the long wire in the direction
shown.
Which of the following statements
about the current induced in the loop
is correct?
1. the induced current is clockwise and proportional to I
2. the induced current is counterclockwise and proportional to I
3. the induced current is clockwise and proportional to I2
4. the induced current is counterclockwise and proportional to I2
5. there is no induced current
Q29.5
The rectangular loop of wire is being
moved to the right at constant
velocity. A constant current I flows
in the long wire in the direction
shown.
Which of the following statements
about the current induced in the loop
is correct?
1. the induced current is clockwise and proportional to I
2. the induced current is counterclockwise and proportional to I
3. the induced current is clockwise and proportional to I2
4. the induced current is counterclockwise and proportional to I2
5. there is no induced current
A29.5
The rectangular loop of wire is being
moved to the right at constant
velocity. A constant current I flows
in the long wire in the direction
shown.
Which of the following statements
about the current induced in the loop
is correct?
1. the induced current is clockwise and proportional to I
2. the induced current is counterclockwise and proportional to I
3. the induced current is clockwise and proportional to I2
4. the induced current is counterclockwise and proportional to I2
5. there is no induced current
Q29.6
The rectangular loop of wire is being
moved to the right at constant
velocity. A constant current I flows
in the long wire in the direction
shown.
Which are the directions of the
magnetic forces on the left-hand (L)
and right-hand (R) sides of the loop?
1. L side: force to the left; R side: force to the left
2. L side: force to the left; R side: force to the right
3. L side: force to the right; R side: force to the left
4. L side: force to the right; R side: force to the right
5. none of the above
A29.6
The rectangular loop of wire is being
moved to the right at constant
velocity. A constant current I flows
in the long wire in the direction
shown.
Which are the directions of the
magnetic forces on the left-hand (L)
and right-hand (R) sides of the loop?
1. L side: force to the left; R side: force to the left
2. L side: force to the left; R side: force to the right
3. L side: force to the right; R side: force to the left
4. L side: force to the right; R side: force to the right
5. none of the above
Q29.7
The drawing shows the uniform
magnetic field inside a long, straight
solenoid. The field is directed into the
plane of the drawing, and is increasing.
What is the direction of the electric
force on a positive point charge placed
at point a, point b, or point c (the center
of the solenoid)?
1. a: to the left; b: straight up; c: down and to the left
2. a: to the right; b: straight down; c: up and to the right
3. a: to the left; b: straight up; c: no force
4. a: to the right; b: straight down; c: no force
5. none of the above
A29.7
The drawing shows the uniform
magnetic field inside a long, straight
solenoid. The field is directed into the
plane of the drawing, and is increasing.
What is the direction of the electric
force on a positive point charge placed
at point a, point b, or point c (the center
of the solenoid)?
1. a: to the left; b: straight up; c: down and to the left
2. a: to the right; b: straight down; c: up and to the right
3. a: to the left; b: straight up; c: no force
4. a: to the right; b: straight down; c: no force
5. none of the above