Question 1

A wire in the shape of an "M" lies in the plane of the paper. It carries a current of 2.0 A, flowing from points A to E, as shown in the figure. It is placed in a uniform magnetic field of 0.75 T in the same plane, directed as shown on the right side of the figure. The figure indicates the dimensions of the wire. What are the magnitude and direction of the force acting on  (a) section AB of this wire?
(b) section BC of this wire?
(c) section CD of this wire?
(d) section DE of this wire?
(e) the entire wire?

Accepted Answer

(a) 0.11 N perpendicular out o...

Question 2

A wire segment 1.2 m long carries a current I = 3.5 A and is oriented as shown in the figure. A uniform magnetic field of magnitude 0.50 T pointing toward the -x direction is present as shown. The +z-axis points directly into the page. What is the magnetic force vector on the wire segment?

Accepted Answer

A)   +1.6 N 
B)   -1.6 N 
C)   +1.6 N 
D)   (+1.3  - 1.6  )  N
E)   (-1.3  + 1.6  )  NF) B) and E)
G) A) and E)

Question 3

An electron moving in the direction of the +x-axis enters a magnetic field. If the electron experiences a magnetic deflection in the -y direction, the direction of the magnetic field in this region points in the direction of the

Accepted Answer

A)   +z-axis.
B)   -z-axis.
C)   -x-axis.
D)   +y-axis.
E)   -y-axis.F) B) and C)
G) None of the above

Question 4

A point charge Q moves on the x-axis in the positive direction with a speed of 0 = 4π × 10-7 T ∙ m/A)  A)  0.57 μT B)  0.74 μT C)  0.92 μT D)  1.1 μT E)  1.3 μT" class="answers-bank-image d-inline" rel="preload" > A point P is on the y-axis at 0 = 4π × 10-7 T ∙ m/A)  A)  0.57 μT B)  0.74 μT C)  0.92 μT D)  1.1 μT E)  1.3 μT" class="answers-bank-image d-inline" rel="preload" > The magnetic field produced at point P, as the charge moves through the origin, is equal to 0 = 4π × 10-7 T ∙ m/A)  A)  0.57 μT B)  0.74 μT C)  0.92 μT D)  1.1 μT E)  1.3 μT" class="answers-bank-image d-inline" rel="preload" > When the charge is at 0 = 4π × 10-7 T ∙ m/A)  A)  0.57 μT B)  0.74 μT C)  0.92 μT D)  1.1 μT E)  1.3 μT" class="answers-bank-image d-inline" rel="preload" > what is the magnitude of the magnetic field at point P? (μ0 = 4π × 10-7 T ∙ m/A)

Accepted Answer

A)   0.57 μT
B)   0.74 μT
C)   0.92 μT
D)   1.1 μT
E)   1.3 μTF) A) and C)
G) None of the above

Question 5

An L-shaped metal machine part is made of two equal-length segments that are perpendicular to each other and carry a 4.50-A current as shown in the figure. This part has a total mass of 3.80 kg and a total length of 3.00 m, and it is in an external 1.20-T magnetic field that is oriented perpendicular to the plane of the part, as shown. What is the magnitude of the NET magnetic force that the field exerts on the part?

Accepted Answer

A)   8.10 N
B)   11.5 N
C)   16.2 N
D)   22.9 N
E)   32.4 NF) None of the above
G) C) and D)

Question 6

At what distance from the central axis of a long straight thin wire carrying a current of 5.0 A is the magnitude of the magnetic field due to the wire equal to the strength of the Earth's magnetic field of about 5.0 × 10-5 T? (μ0 = 4π × 10-7 T ∙ m/A)

Accepted Answer

A)   1.0 cm
B)   2.0 cm
C)   3.0 cm
D)   4.0 cm
E)   5.0 cmF) A) and B)
G) B) and E)

Question 7

A hollow cylinder with an inner radius of 0 = 4π × 10-7 T ∙ m/A)  A)  7.2 × 10-6 T B)  8.0 × 10-6 T C)  8.9 × 10-7 T D)  7.1 × 10-8 T" class="answers-bank-image d-inline" rel="preload" > and an outer radius of 0 = 4π × 10-7 T ∙ m/A)  A)  7.2 × 10-6 T B)  8.0 × 10-6 T C)  8.9 × 10-7 T D)  7.1 × 10-8 T" class="answers-bank-image d-inline" rel="preload" > conducts a 3.0-A current flowing parallel to the axis of the cylinder. If the current density is uniform throughout the wire, what is the magnitude of the magnetic field at a point 0 = 4π × 10-7 T ∙ m/A)  A)  7.2 × 10-6 T B)  8.0 × 10-6 T C)  8.9 × 10-7 T D)  7.1 × 10-8 T" class="answers-bank-image d-inline" rel="preload" > from its center? (μ0 = 4π × 10-7 T ∙ m/A)

Accepted Answer

A)   7.2 × 10-6 T
B)   8.0 × 10-6 T
C)   8.9 × 10-7 T
D)   7.1 × 10-8 TE) B) and C)
F) B) and D)

Question 8

A straight wire that is 0.60 m long is carrying a current of 2.0 A. It is placed in a uniform magnetic field of strength 0.30 T. If the wire experiences a force of 0.18 N, what angle does the wire make with respect to the magnetic field?

Accepted Answer

A)   25°
B)   30°
C)   35°
D)   60°
E)   90°F) A) and B)
G) A) and C)

Question 9

A negatively charged particle is moving to the right, directly above a wire having a current flowing to the right, as shown in the figure. In which direction is the magnetic force exerted on the particle?

Accepted Answer

A)   into the page
B)   out of the page
C)   downward
D)   upward
E)   The magnetic force is zero since the velocity is parallel to the current.F) C) and E)
G) A) and E)

Question 10

A uniform magnetic field of magnitude 0.80 T in the negative z-direction is present in a region of space, as shown in the figure. A uniform electric field is also present. An electron that is projected with an initial velocity  in the positive x-direction passes through the region without deflection. What is the electric field vector in the region?

Accepted Answer

A)   -73 kV/m 
B)   +73 kV/m 
C)   +110 kV/m 
D)   +110 kV/m 
E)   -110 kV/m F) C) and E)
G) D) and E)

Question 11

An alpha particle is moving at a speed of 5.0 × 105 m/s in a direction perpendicular to a uniform magnetic field of strength 0.040 T. The charge on an alpha particle is 3.2 × 10-19 C and its mass is 6.6 × 10-27 kg.
(a) What is the radius of the path of the alpha particle?
(b) How long does it take the alpha particle to make one complete revolution around its path?

Accepted Answer

(a) 0.26 m...

Question 12

A vertical wire carries a current straight down. To the east of this wire, the magnetic field points

Accepted Answer

A)   toward the north.
B)   toward the east.
C)   toward the west.
D)   toward the south.
E)   downward.F) A) and E)
G) B) and C)

Question 13

A solenoid with 400 turns has a radius of 0.040 m and is 40 cm long. If this solenoid carries a current of 0 = 4π × 10-7 T ∙ m/A)  A)  16 mT B)  4.9 mT C)  15 mT D)  6.0 mT E)  9.0 mT" class="answers-bank-image d-inline" rel="preload" > what is the magnitude of the magnetic field near the center of the solenoid? (μ0 = 4π × 10-7 T ∙ m/A)

Accepted Answer

A)   16 mT
B)   4.9 mT
C)   15 mT
D)   6.0 mT
E)   9.0 mTF) C) and E)
G) B) and E)

Question 14

A very long, hollow, thin-walled conducting cylindrical shell (like a pipe)  of radius R carries a current along its length uniformly distributed throughout the thin shell. Which one of the graphs shown in the figure most accurately describes the magnitude B of the magnetic field produced by this current as a function of the distance r from the central axis?

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   5F) C) and D)
G) A) and E)

Question 15

The figure shows two long wires carrying equal currents I1 and I2 flowing in opposite directions. Which of the arrows labeled A through D correctly represents the direction of the magnetic field due to the wires at a point located at an equal distance d from each wire? 1 and I2 flowing in opposite directions. Which of the arrows labeled A through D correctly represents the direction of the magnetic field due to the wires at a point located at an equal distance d from each wire?   A)  A B)  B C)  C D)  D E)  The magnetic field is zero at that point." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   A
B)   B
C)   C
D)   D
E)   The magnetic field is zero at that point.F) C) and D)
G) B) and C)

Question 16

As shown in the figure, a wire is bent into the shape of a tightly closed omega (Ω) , with a circular loop of radius 4.0 cm and two long straight sections. The loop is in the xy-plane, with the center at the origin. The straight sections are parallel to the x-axis. The wire carries a 5.0-A current, as shown. What is the magnitude of the magnetic field at the center of the loop? (μ0 = 4π × 10-7 T ∙ m/A)  0 = 4π × 10-7 T ∙ m/A)    A)  25 µT B)  40 µT C)  54 µT D)  80 µT E)  104 µT" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   25 µT
B)   40 µT
C)   54 µT
D)   80 µT
E)   104 µTF) D) and E)
G) A) and B)

Question 17

A circular loop of wire of radius 10 cm carries a current of 6.0 A. What is the magnitude of the magnetic field at the center of the loop? (μ0 = 4π × 10-7 T ∙ m/A)

Accepted Answer

A)   3.8 × 10-5 T
B)   3.8 × 10-7 T
C)   1.2 × 10-5 T
D)   1.2 × 10-7 T
E)   3.8 × 10-8 TF) A) and E)
G) C) and E)

Question 18

The magnetic field at a distance of 2 cm from a current carrying wire is 4 μT. What is the magnetic field at a distance of 4 cm from the wire?

Accepted Answer

A)   1/2 µT
B)   1 µT
C)   2 µT
D)   4 µT
E)   8 µTF) B) and D)
G) B) and C)

Question 19

The figure shows two long, parallel current-carrying wires. The wires carry equal currents I1 = I2 = 20 A in the directions indicated and are located a distance d = 0.5 m apart. Calculate the magnitude and direction of the magnetic field at the point P that is located an equal distance d from each wire. (μ0 = 4π × 10-7 T ∙ m/A)  1 = I2 = 20 A in the directions indicated and are located a distance d = 0.5 m apart. Calculate the magnitude and direction of the magnetic field at the point P that is located an equal distance d from each wire. (μ0 = 4π × 10-7 T ∙ m/A)    A)  8 µT downward B)  8 µT upward C)  4 µT downward D)  4 µT upward E)  4 µT to the right" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   8 µT downward
B)   8 µT upward
C)   4 µT downward
D)   4 µT upward
E)   4 µT to the rightF) C) and D)
G) B) and E)

Question 20

Consider a solenoid of length L, N windings, and radius b (L is much longer than b) . A current I is flowing through the wire. If the length of the solenoid became twice as long (2L) , and all other quantities remained the same, the magnetic field inside the solenoid would

Accepted Answer

A)   remain the same.
B)   become twice as strong.
C)   become one half as strong.D) A) and B)
E) A) and C)

Exam 29: The Magnetic Field

Correct Answer
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(a) 0.26 m...
View Answer

A solenoid with 400 turns has a radius of 0.040 m and is 40 cm long. If this solenoid carries a current of what is the magnitude of the magnetic field near the center of the solenoid? (μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
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Correct Answer
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The magnetic field at a distance of 2 cm from a current carrying wire is 4 μT. What is the magnetic field at a distance of 4 cm from the wire?

Correct Answer
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A negatively charged particle is moving to the right, directly above a wire having a current flowing to the right, as shown in the figure. In which direction is the magnetic force exerted on the particle?

Correct Answer
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A straight wire that is 0.60 m long is carrying a current of 2.0 A. It is placed in a uniform magnetic field of strength 0.30 T. If the wire experiences a force of 0.18 N, what angle does the wire make with respect to the magnetic field?

Correct Answer
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Correct Answer
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An electron moving in the direction of the +x-axis enters a magnetic field. If the electron experiences a magnetic deflection in the -y direction, the direction of the magnetic field in this region points in the direction of the

Correct Answer
verified

Correct Answer
verified

A circular loop of wire of radius 10 cm carries a current of 6.0 A. What is the magnitude of the magnetic field at the center of the loop? (μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
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Correct Answer
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A vertical wire carries a current straight down. To the east of this wire, the magnetic field points

Correct Answer
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Correct Answer
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Correct Answer
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(a) 0.11 N perpendicular out o...
View Answer

Correct Answer
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The figure shows two long wires carrying equal currents I₁ and I₂ flowing in opposite directions. Which of the arrows labeled A through D correctly represents the direction of the magnetic field due to the wires at a point located at an equal distance d from each wire?

Correct Answer
verified

At what distance from the central axis of a long straight thin wire carrying a current of 5.0 A is the magnitude of the magnetic field due to the wire equal to the strength of the Earth's magnetic field of about 5.0 × 10^-5 T? (μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
verified

Consider a solenoid of length L, N windings, and radius b (L is much longer than b) . A current I is flowing through the wire. If the length of the solenoid became twice as long (2L) , and all other quantities remained the same, the magnetic field inside the solenoid would

Correct Answer
verified

A hollow cylinder with an inner radius of and an outer radius of conducts a 3.0-A current flowing parallel to the axis of the cylinder. If the current density is uniform throughout the wire, what is the magnitude of the magnetic field at a point from its center? (μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
verified

A wire segment 1.2 m long carries a current I = 3.5 A and is oriented as shown in the figure. A uniform magnetic field of magnitude 0.50 T pointing toward the -x direction is present as shown. The +z-axis points directly into the page. What is the magnetic force vector on the wire segment?

Correct Answer
verified

Exam 29: The Magnetic Field

Correct Answerverified(a) 0.26 m...View AnswerShow Answer

A solenoid with 400 turns has a radius of 0.040 m and is 40 cm long. If this solenoid carries a current of what is the magnitude of the magnetic field near the center of the solenoid? (μ0 = 4π × 10-7 T ∙ m/A)

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The magnetic field at a distance of 2 cm from a current carrying wire is 4 μT. What is the magnetic field at a distance of 4 cm from the wire?

Correct AnswerverifiedShow Answer

A negatively charged particle is moving to the right, directly above a wire having a current flowing to the right, as shown in the figure. In which direction is the magnetic force exerted on the particle?

Correct AnswerverifiedShow Answer

A straight wire that is 0.60 m long is carrying a current of 2.0 A. It is placed in a uniform magnetic field of strength 0.30 T. If the wire experiences a force of 0.18 N, what angle does the wire make with respect to the magnetic field?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

An electron moving in the direction of the +x-axis enters a magnetic field. If the electron experiences a magnetic deflection in the -y direction, the direction of the magnetic field in this region points in the direction of the

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A circular loop of wire of radius 10 cm carries a current of 6.0 A. What is the magnitude of the magnetic field at the center of the loop? (μ0 = 4π × 10-7 T ∙ m/A)

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A vertical wire carries a current straight down. To the east of this wire, the magnetic field points

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct Answerverified(a) 0.11 N perpendicular out o...View AnswerShow Answer

Correct AnswerverifiedShow Answer

The figure shows two long wires carrying equal currents I1 and I2 flowing in opposite directions. Which of the arrows labeled A through D correctly represents the direction of the magnetic field due to the wires at a point located at an equal distance d from each wire?

Correct AnswerverifiedShow Answer

At what distance from the central axis of a long straight thin wire carrying a current of 5.0 A is the magnitude of the magnetic field due to the wire equal to the strength of the Earth's magnetic field of about 5.0 × 10-5 T? (μ0 = 4π × 10-7 T ∙ m/A)

Correct AnswerverifiedShow Answer

Consider a solenoid of length L, N windings, and radius b (L is much longer than b) . A current I is flowing through the wire. If the length of the solenoid became twice as long (2L) , and all other quantities remained the same, the magnetic field inside the solenoid would

Correct AnswerverifiedShow Answer

A hollow cylinder with an inner radius of and an outer radius of conducts a 3.0-A current flowing parallel to the axis of the cylinder. If the current density is uniform throughout the wire, what is the magnitude of the magnetic field at a point from its center? (μ0 = 4π × 10-7 T ∙ m/A)

Correct AnswerverifiedShow Answer

A wire segment 1.2 m long carries a current I = 3.5 A and is oriented as shown in the figure. A uniform magnetic field of magnitude 0.50 T pointing toward the -x direction is present as shown. The +z-axis points directly into the page. What is the magnetic force vector on the wire segment?

Correct AnswerverifiedShow Answer

Correct Answer
verified
(a) 0.26 m...
View Answer

A solenoid with 400 turns has a radius of 0.040 m and is 40 cm long. If this solenoid carries a current of what is the magnitude of the magnetic field near the center of the solenoid? (μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A circular loop of wire of radius 10 cm carries a current of 6.0 A. What is the magnitude of the magnetic field at the center of the loop? (μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
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Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
(a) 0.11 N perpendicular out o...
View Answer

Correct Answer
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The figure shows two long wires carrying equal currents I₁ and I₂ flowing in opposite directions. Which of the arrows labeled A through D correctly represents the direction of the magnetic field due to the wires at a point located at an equal distance d from each wire?

Correct Answer
verified

At what distance from the central axis of a long straight thin wire carrying a current of 5.0 A is the magnitude of the magnetic field due to the wire equal to the strength of the Earth's magnetic field of about 5.0 × 10^-5 T? (μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
verified

Correct Answer
verified

A hollow cylinder with an inner radius of and an outer radius of conducts a 3.0-A current flowing parallel to the axis of the cylinder. If the current density is uniform throughout the wire, what is the magnitude of the magnetic field at a point from its center? (μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
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Correct Answer
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