Download Quiz 11-1b Magnetism

AP Physics
Magnetism
Name_____________________
Mrs. Tsarevsky
Quiz 11-1
____ 1. An overhead electric power line carries a maximum current of 125 A. What is the
magnitude of the maximum magnetic field at a point 4.50 m directly below the
power line?
a) 5.56  106 T
d) 4.69  104 T
5
b) 1.75  10 T
e) 7.95  103 T
c) 3.49  105 T
Use the following to answer questions 2-3:
A long straight vertical segment of wire traverses a magnetic field of magnitude 2.0 T in the
direction shown in the diagram. The length of the wire that lies in the magnetic field is 0.060 m.
When the switch is closed, a current of 4.0 A flows through the wire from point P to point Q.
____ 2. What is the magnitude of the magnetic force acting on the wire?
a) 0.12 N b) 0.24 N c) 0.48 N d) 67 N e) zero newtons
____ 3. Which one of the following statements concerning the effect of the magnetic force
on the wire is true?
a) The wire will be pushed to the left.
b) The wire will be pushed to the right.
c) The wire will have no net force acting on it.
d) The wire will be pushed downward, into the plane of the paper.
e) The wire will be pushed upward, out of the plane of the paper.
____ 4. An electron traveling due north enters a region that contains a uniform magnetic
field that points due east. In which direction will the electron be deflected?
a) east b) west c) down d) up e) south
5. Two loops carry equal currents I in the same direction. They are held in the
positions shown in the figure and project above and below the plane of the paper.
The point P lies exactly halfway between them on the line that joins their centers.
The centers of the loops and the point P lie in the plane of the paper. Which one
of the figures below shows the position of a compass needle if the compass were
placed in the plane of the paper at P?
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AP Physics
Name_____________________
Mrs. Tsarevsky
Magnetism
Quiz 11-1
Use the following to answer questions 6-7:
A long, straight wire is carrying a current of 5 A in the direction shown in the figure. The point
P is 0.04 m from the wire.
____ 6. What is the direction of the magnetic field at point P due to the current in the
wire?
a) to the right of page
d) into the plane of the page
b) to the left of the page
e) out of the plane of the page
c) toward the bottom of the page
____ 7. What is the magnitude of the magnetic field at the point P?
a) 1.3  105 T
d) 7.9  105 T
b) 1.9  105 T
e) 9.4  105 T
c) 2.5  105 T
____ 8. A proton traveling due east in a region that contains only a magnetic field
experiences a vertically upward force away from the surface of the earth. What is
the direction of the magnetic field?
a) north b) east c) south d) west e) down
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AP Physics
Name_____________________
Mrs. Tsarevsky
Magnetism
Quiz 11-1
____ 9. An electron traveling horizontally enters a region where a uniform magnetic field
is directed into the plane of the paper as shown. Which one of the following
phrases most accurately describes the motion of the electron once it has entered
the field?
a) upward and parabolic
b) upward and circular
c) downward and circular
d) upward, along a straight line
e) downward and parabolic
Use the following to answer questions 10-11:
Two long, straight wires separated by 0.10 m carry currents of 18 A and 6 A in the same
direction as shown.
____ 10. What is the direction of the magnetic field at the point P?
a) to the left of the page
d) out of the plane of the page
b) to the right of the page
e) into the plane of the page
c) toward the bottom of the page
____ 11. Determine the magnitude of the magnetic field at the point P.
a) 2.4  105 T
d) 9.6  105 T
b) 4.8  105 T
e) zero tesla
c) 7.2  105 T
12. A long wire that carries a current I is bent into five loops as shown in the figure.
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AP Physics
Magnetism
Name_____________________
Mrs. Tsarevsky
Quiz 11-1
If the observer could "see" the magnetic field inside this arrangement of loops,
how would it appear?
____ 13. A long, straight wire carries a 6.0-A current that is directed in the positive x
direction. When a uniform magnetic field is applied perpendicular to a 3.0-m
segment of the wire, the magnetic force on the segment is 0.36 N, directed in the
negative y direction, as shown. What are the magnitude and direction of the
magnetic field?
a) 0.020 T, out of the paper
b) 0.020 T, into the paper
c) 0.060 T, out of the paper
d) 0.060 T, into the paper
e) 0.65 T, out of the paper
____ 14. Which one of the following statements concerning permanent magnets is false?
a) The north pole of a permanent magnet is attracted to a south pole.
b) All permanent magnets are surrounded by a magnetic field.
c) The direction of a magnetic field is indicated by the north pole of a compass.
d) Magnetic field lines outside a permanent magnet originate from the north pole
and end on the south pole.
e) When a permanent magnet is cut in half, one piece will be a north pole and
one piece will be a south pole.
____ 15. Two charged particles of equal mass are traveling in circular orbits in a region of
uniform, constant magnetic field as shown. The particles are observed to move in
circular paths of radii R1 and R2 with speeds v1 and v2, respectively.
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AP Physics
Name_____________________
Mrs. Tsarevsky
Magnetism
Quiz 11-1
As the figure shows, the path of particle 2 has a smaller radius than that of particle
1. Which one of the following statements about this system is false?
a) |v1/Q1| < |v2/Q2|
b) Particle 2 carries a positive charge.
c) Particle 1 carries a negative charge.
d) Neither particle gains energy from the magnetic field.
e) The particle velocities have no components parallel to the magnetic field.
____ 16. A wire, connected to a battery and switch, passes through the center of a long
current-carrying solenoid as shown in the drawing.
When the switch is closed and there is a current in the wire, what happens to the
portion of the wire that runs inside of the solenoid?
a) There is no effect on the wire.
b) The wire is pushed downward.
c) The wire is pushed upward.
d) The wire is pushed into the plane of the paper.
e) The wire is pushed out of the plane of the paper.
____ 17. A charged particle is fired from a gun with a velocity of 5.2  104 m/s at an angle
of 35° with respect to a 0.0045-T magnetic field. If the magnetic field exerts a
force of 0.0026 N on the particle, determine the magnitude of the charge.
a) 11 µC b) 15 µC c) 19 µC d) 23 µC e) 27 µC
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AP Physics
Name_____________________
Mrs. Tsarevsky
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Magnetism
Quiz 11-1
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