Question 1

A beam consisting of five types of ions labeled A, B, C, D, and E enters a region that contains a uniform magnetic field as shown in the figure below. The field is perpendicular to the plane of the paper, but its precise direction is not given. All ions in the beam travel with the same speed. The table below gives the masses and charges of the ions. Note: 1 mass unit = 1.67 × 10-27 kg and e = 1.6 × 10-19 C -27 kg and e = 1.6 × 10-19 C   -What is the direction of the magnetic field? A) toward the right B) toward the left C) into the page D) out of the page of the page E) toward the bottom" class="answers-bank-image d-inline" rel="preload" >
-What is the direction of the magnetic field?

Accepted Answer

A)  toward the right
B)  toward the left
C)  into the page
D)  out of the page of the page
E)  toward the bottomF) B) and C)
G) None of the above

Question 2

Each second, 1.25 × 1019 electrons in a narrow beam pass through a small hole in a wall. The beam is perpendicular to the wall. Using Ampere's law, determine the magnitude of the magnetic field in the wall at a radius of 0.750 m from the center of the beam.

Accepted Answer

A)  1.18 × 10-9 T
B)  5.34 × 10-7 T
C)  2.62 × 10-3 T
D)  4.14 × 108 T
E)  3.33 × 1012 TF) C) and D)
G) C) and E)

Question 3

A coil of wire carries current I as shown in the figure. If the observer could "see" the magnetic field inside this arrangement of loops, how would it appear?

Accepted Answer

A)  a
B)  b
C)  c
D)  d
E)  eF) A) and E)
G) All of the above

Question 4

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. 1 and R2 with speeds v1 and v2, respectively.   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| 2/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." class="answers-bank-image d-inline" rel="preload" > 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?

Accepted Answer

A)  |v1/Q1| 2/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.F) A) and E)
G) None of the above

Question 5

A single circular loop of wire with radius 0.025 m carries a current of 6.0 A. It is placed at the center of a solenoid that has length 0.60 m, radius 0.075 m, and 1200 turns. -1 A B) 2.5 × 10-4 A C) 6.0 × 10-2 A D) 5.0 × 10-3 A E) 9.3 × 10-2 A" class="answers-bank-image d-inline" rel="preload" >
-Determine the value of the current in the solenoid so that the magnetic field at the center of the loop is zero tesla.

Accepted Answer

A)  1.4 × 10-1 A
B)  2.5 × 10-4 A
C)  6.0 × 10-2 A
D)  5.0 × 10-3 A
E)  9.3 × 10-2 AF) None of the above
G) A) and B)

Question 6

Two charged particles are traveling in circular orbits with the same speed in a region of uniform magnetic field that is directed into the page, as shown. The magnitude of the charge on each particle is identical, but the signs of the charges are unequal.  Which one of the entries in the table below is correct?

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) All of the above
G) B) and E)

Question 7

The drawing shows two long, thin wires that carry currents in the positive z direction. Both wires are parallel to the z axis. The 50-A wire is in the x-z plane and is 5 m from the z axis. The 40-A wire is in the y-z plane and is 4 m from the z axis. What is the magnitude of the magnetic field at the origin? -6 T C) 3 × 10-6 T D) 4 × 10-6 T E) 6 × 10-6 T" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  zero tesla
B)  1 × 10-6 T
C)  3 × 10-6 T
D)  4 × 10-6 T
E)  6 × 10-6 TF) A) and D)
G) D) and E)

Question 8

Which one of the following statements best explains why a constant magnetic field can do no work on a moving charged particle?

Accepted Answer

A)  The magnetic field is conservative.
B)  The magnetic force is a velocity dependent force.
C)  The magnetic field is a vector and work is a scalar quantity.
D)  The magnetic force is always perpendicular to the velocity of the particle.
E)  The electric field associated with the particle cancels the effect of the magnetic field on the particle.F) C) and D)
G) A) and E)

Question 9

A long, straight wire carries a 10.0-A current in the +y direction as shown in the figure.  Next to the wire is a square copper loop that carries a 2.00-A current as shown. The length of each side of the square is 1.00 m.
-What is the direction of the net magnetic force that acts on the loop?

Accepted Answer

A)  +x direction
B)  -x direction
C)  +y direction
D)  -y direction
E)  30° with respect to the +x directionF) B) and E)
G) D) and E)

Question 10

A wire is bent into the shape of a circle of radius r = 0.10 m and carries a 20.0-A current in the direction shown. -5 T B) 1.3 × 10-5 T C) 2.0 × 10-4 T D) 1.3 × 10-4 T E) zero tesla" class="answers-bank-image d-inline" rel="preload" >
-What is the magnitude of the magnetic field at the center of the loop?

Accepted Answer

A)  2.0 × 10-5 T
B)  1.3 × 10-5 T
C)  2.0 × 10-4 T
D)  1.3 × 10-4 T
E)  zero teslaF) A) and B)
G) A) and D)

Question 11

Complete the following statement: The magnetic field around a current-carrying, circular loop is most like that of

Accepted Answer

A)  the earth.
B)  a short bar magnet.
C)  a current-carrying, rectangular loop.
D)  a long straight wire that carries a current.
E)  two long straight wires that carry currents in opposite directions.F) A) and B)
G) A) and C)

Question 12

A charged particle is launched 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 on the particle.

Accepted Answer

A)  11 µC
B)  15 µC
C)  19 µC
D)  23 µC
E)  27 µCF) D) and E)
G) C) and D)

Question 13

A long straight wire carries a 40.0 A current in the +x direction. At a particular instant, an electron moving at 1.0 × 107 m/s in the +y direction is 0.10 m from the wire. The charge on the electron is -1.6 × 10-19 C. What is the force on the electron at this instant? 7 m/s in the +y direction is 0.10 m from the wire. The charge on the electron is -1.6 × 10-19 C. What is the force on the electron at this instant?   A) 1.3 × 10-16 N in the +x direction B) 1.3 × 10-16 N in the -x direction C) 6.5 × 10-10 N in the +y direction D) 6.5 × 10-10 N in the -y direction E) 6.5 × 10-16 N in the -y direction" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  1.3 × 10-16 N in the +x direction
B)  1.3 × 10-16 N in the -x direction
C)  6.5 × 10-10 N in the +y direction
D)  6.5 × 10-10 N in the -y direction
E)  6.5 × 10-16 N in the -y directionF) B) and E)
G) B) and C)

Question 14

A long, coaxial cable, shown in cross-section in the drawing, is made using two conductors that share a common central axis, labeled C. The conductors are separated by an electrically insulating material that is also used as the outer cover of the cable. The current in the inner conductor is 2.0 A directed into the page and that in the outer conductor is 2.5 A directed out of the page. The distance from point C to point A is 0.0015 m; and the distance from C to B is 0.0030 m. The radii a and b of the conductors are 6.0 × 10-4 m and 1.9 × 10-3 m, respectively. -5 T, clockwise B) 3.3 × 10-5 T, counterclockwise C) 6.8 × 10-5 T, clockwise D) 6.8 × 10-5 T, counterclockwise E) 2.7 × 10-4 T, clockwise" class="answers-bank-image d-inline" rel="preload" >
-What is the magnitude and direction of the magnetic field at point B?

Accepted Answer

A)  3.3 × 10-5 T, clockwise
B)  3.3 × 10-5 T, counterclockwise
C)  6.8 × 10-5 T, clockwise
D)  6.8 × 10-5 T, counterclockwise
E)  2.7 × 10-4 T, clockwiseF) D) and E)
G) C) and D)

Question 15

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?

Accepted Answer

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 paperF) D) and E)
G) B) and C)

Question 16

Two long, straight wires separated by 0.10 m carry currents of 18 A and 6 A in the same direction as shown. 
-What is the direction of the magnetic field at the point P?

Accepted Answer

A)  to the left of the page
B)  to the right of the page
C)  toward the bottom of the page
D)  out of the plane of the page
E)  into the plane of the pageF) A) and B)
G) C) and D)

Question 17

A long, straight wire carries a 10.0-A current in the +y direction as shown in the figure. -6 N B) 1.1 × 10-5 N C) 1.4 × 10-5 N D) 1.7 × 10-5 N E) 2.3 × 10-5 N" class="answers-bank-image d-inline" rel="preload" > Next to the wire is a square copper loop that carries a 2.00-A current as shown. The length of each side of the square is 1.00 m.
-What is the magnitude of the net magnetic force that acts on the loop?

Accepted Answer

A)  8.0 × 10-6 N
B)  1.1 × 10-5 N
C)  1.4 × 10-5 N
D)  1.7 × 10-5 N
E)  2.3 × 10-5 NF) A) and B)
G) A) and E)

Question 18

A long, straight wire is carrying a current of 5.0 A in the direction shown in the figure. The point P is 0.040 m from the wire. 
-What is the direction of the magnetic field at point P due to the current in the wire?

Accepted Answer

A)  to the right of page
B)  to the left of the page
C)  toward the bottom of the page
D)  into the plane of the page
E)  out of the plane of the pageF) All of the above
G) D) and E)

Question 19

A single circular loop of radius 1.00 m carries a current of 10.0 mA. It is placed in a uniform magnetic field of magnitude 0.500 T that is directed parallel to the plane of the loop as suggested in the figure. What is the magnitude of the torque exerted on the loop by the magnetic field? -2 N . m B) 3.14 × 10-2 N . m C) 6.28 × 10-2 N . m D) 9.28 × 10-2 N . m E) zero N . m" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  1.57 × 10-2 N . m
B)  3.14 × 10-2 N . m
C)  6.28 × 10-2 N . m
D)  9.28 × 10-2 N . m
E)  zero N . mF) A) and B)
G) A) and C)

Question 20

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. 
-Which one of the following statements concerning the effect of the magnetic force on the wire is true?

Accepted Answer

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.F) B) and C)
G) None of the above

Exam 21: Magnetic Forces and Magnetic Fields

A single circular loop of radius 1.00 m carries a current of 10.0 mA. It is placed in a uniform magnetic field of magnitude 0.500 T that is directed parallel to the plane of the loop as suggested in the figure. What is the magnitude of the torque exerted on the loop by the magnetic field?

Correct Answer
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A coil of wire carries current I as shown in the figure. If the observer could "see" the magnetic field inside this arrangement of loops, how would it appear?

Correct Answer
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A long, straight wire carries a 10.0-A current in the +y direction as shown in the figure. Next to the wire is a square copper loop that carries a 2.00-A current as shown. The length of each side of the square is 1.00 m. -What is the direction of the net magnetic force that acts on the loop?

Correct Answer
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Correct Answer
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Which one of the following statements best explains why a constant magnetic field can do no work on a moving charged particle?

Correct Answer
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Correct Answer
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A long straight wire carries a 40.0 A current in the +x direction. At a particular instant, an electron moving at 1.0 × 10⁷ m/s in the +y direction is 0.10 m from the wire. The charge on the electron is -1.6 × 10^-¹⁹ C. What is the force on the electron at this instant?

Correct Answer
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A wire is bent into the shape of a circle of radius r = 0.10 m and carries a 20.0-A current in the direction shown. -What is the magnitude of the magnetic field at the center of the loop?

Correct Answer
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A charged particle is launched 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 on the particle.

Correct Answer
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Correct Answer
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Each second, 1.25 × 10¹⁹ electrons in a narrow beam pass through a small hole in a wall. The beam is perpendicular to the wall. Using Ampere's law, determine the magnitude of the magnetic field in the wall at a radius of 0.750 m from the center of the beam.

Correct Answer
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Correct Answer
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Correct Answer
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A single circular loop of wire with radius 0.025 m carries a current of 6.0 A. It is placed at the center of a solenoid that has length 0.60 m, radius 0.075 m, and 1200 turns. -Determine the value of the current in the solenoid so that the magnetic field at the center of the loop is zero tesla.

Correct Answer
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Complete the following statement: The magnetic field around a current-carrying, circular loop is most like that of

Correct Answer
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A long, straight wire carries a 10.0-A current in the +y direction as shown in the figure. Next to the wire is a square copper loop that carries a 2.00-A current as shown. The length of each side of the square is 1.00 m. -What is the magnitude of the net magnetic force that acts on the loop?

Correct Answer
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Correct Answer
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Correct Answer
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A long, straight wire is carrying a current of 5.0 A in the direction shown in the figure. The point P is 0.040 m from the wire. -What is the direction of the magnetic field at point P due to the current in the wire?

Correct Answer
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Two long, straight wires separated by 0.10 m carry currents of 18 A and 6 A in the same direction as shown. -What is the direction of the magnetic field at the point P?

Correct Answer
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Exam 21: Magnetic Forces and Magnetic Fields

A single circular loop of radius 1.00 m carries a current of 10.0 mA. It is placed in a uniform magnetic field of magnitude 0.500 T that is directed parallel to the plane of the loop as suggested in the figure. What is the magnitude of the torque exerted on the loop by the magnetic field?

Correct AnswerverifiedShow Answer

A coil of wire carries current I as shown in the figure. If the observer could "see" the magnetic field inside this arrangement of loops, how would it appear?

Correct AnswerverifiedShow Answer

A long, straight wire carries a 10.0-A current in the +y direction as shown in the figure. Next to the wire is a square copper loop that carries a 2.00-A current as shown. The length of each side of the square is 1.00 m. -What is the direction of the net magnetic force that acts on the loop?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which one of the following statements best explains why a constant magnetic field can do no work on a moving charged particle?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A long straight wire carries a 40.0 A current in the +x direction. At a particular instant, an electron moving at 1.0 × 107 m/s in the +y direction is 0.10 m from the wire. The charge on the electron is -1.6 × 10-19 C. What is the force on the electron at this instant?

Correct AnswerverifiedShow Answer

A wire is bent into the shape of a circle of radius r = 0.10 m and carries a 20.0-A current in the direction shown. -What is the magnitude of the magnetic field at the center of the loop?

Correct AnswerverifiedShow Answer

A charged particle is launched 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 on the particle.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Each second, 1.25 × 1019 electrons in a narrow beam pass through a small hole in a wall. The beam is perpendicular to the wall. Using Ampere's law, determine the magnitude of the magnetic field in the wall at a radius of 0.750 m from the center of the beam.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A single circular loop of wire with radius 0.025 m carries a current of 6.0 A. It is placed at the center of a solenoid that has length 0.60 m, radius 0.075 m, and 1200 turns. -Determine the value of the current in the solenoid so that the magnetic field at the center of the loop is zero tesla.

Correct AnswerverifiedShow Answer

Complete the following statement: The magnetic field around a current-carrying, circular loop is most like that of

Correct AnswerverifiedShow Answer

A long, straight wire carries a 10.0-A current in the +y direction as shown in the figure. Next to the wire is a square copper loop that carries a 2.00-A current as shown. The length of each side of the square is 1.00 m. -What is the magnitude of the net magnetic force that acts on the loop?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A long, straight wire is carrying a current of 5.0 A in the direction shown in the figure. The point P is 0.040 m from the wire. -What is the direction of the magnetic field at point P due to the current in the wire?

Correct AnswerverifiedShow Answer

Two long, straight wires separated by 0.10 m carry currents of 18 A and 6 A in the same direction as shown. -What is the direction of the magnetic field at the point P?

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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A long straight wire carries a 40.0 A current in the +x direction. At a particular instant, an electron moving at 1.0 × 10⁷ m/s in the +y direction is 0.10 m from the wire. The charge on the electron is -1.6 × 10^-¹⁹ C. What is the force on the electron at this instant?

Correct Answer
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Correct Answer
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A charged particle is launched 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 on the particle.

Correct Answer
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Correct Answer
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Each second, 1.25 × 10¹⁹ electrons in a narrow beam pass through a small hole in a wall. The beam is perpendicular to the wall. Using Ampere's law, determine the magnitude of the magnetic field in the wall at a radius of 0.750 m from the center of the beam.

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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