Question 1

A very long thin wire produces a magnetic field of 0.0050 × 10-4 T at a distance of 3.0 mm. from the central axis of the wire. What is the magnitude of the current in the wire? (μ0 = 4π × 10-7 T ∙ m/A)

Accepted Answer

A)   7.5 mA
B)   1.7 mA
C)   3300 mA
D)   24,000 mAE) C) and D)
F) B) and D)

Question 2

A charged particle is moving with speed v perpendicular to a uniform magnetic field. A second identical charged particle is moving with speed 2v perpendicular to the same magnetic field. If the frequency of revolution of the first particle is f, the frequency of revolution of the second particle is

Accepted Answer

A)   f.
B)   2f.
C)   4f.
D)   f /2.
E)   f /4.F) None of the above
G) All of the above

Question 3

A long straight wire on the z-axis carries a current of 6.0 A in the positive direction. A circular loop in the xy-plane, of radius 10 cm, carries a 1.0-A current, as shown in the figure. Point P, at the center of the loop, is 25 cm from the z-axis. An electron is projected from P with a velocity of 1.0 × 106 m/s in the negative x-direction. What is the y component of the force on the electron? (e = 1.60 × 10-19 C, μ0 = 4π × 10-7 T ∙ m/A)  6 m/s in the negative x-direction. What is the y component of the force on the electron? (e = 1.60 × 10-19 C, μ0 = 4π × 10-7 T ∙ m/A)    A)  -1.0 × 10-18 N B)  +1.0 × 10-18 N C)  -2.0 × 10-18 N D)  +2.0 × 10-18 N E)  zero" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   -1.0 × 10-18 N
B)   +1.0 × 10-18 N
C)   -2.0 × 10-18 N
D)   +2.0 × 10-18 N
E)   zeroF) A) and D)
G) All of the above

Question 4

Two long parallel wires placed side-by-side on a horizontal table carry identical size currents in opposite directions. The wire on your right carries current toward you, and the wire on your left carries current away from you. From your point of view, the magnetic field at the point exactly midway between the two wires

Accepted Answer

A)   points upward.
B)   points downward.
C)   points toward you.
D)   points away from you.
E)   is zero.F) C) and D)
G) B) and C)

Question 5

A proton, with mass 1.67 × 10-27 kg and charge +1.6 × 10-19 C, is sent with velocity 7.1 × 104 m/s in the +x direction into a region where there is a uniform electric field of magnitude 730 V/m in the +y direction. What are the magnitude and direction of the uniform magnetic field in the region, if the proton is to pass through undeflected? Assume that the magnetic field has no x-component and neglect gravitational effects.

Accepted Answer

0.010 T, +...

Question 6

A particle with charge -5.00 C initially moves at  = (1.00 
+ 7.00 
)  m/s. If it encounters a magnetic field 
Find the magnetic force vector on the particle.

Accepted Answer

A)   (-350  + 50.0  )  N
B)   (-350  - 50.0  )  N
C)   (350  + 50.0  )  N
D)   (350  - 50.0  )  NE) B) and C)
F) A) and D)

Question 7

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

Accepted Answer

A)   (+1.1  - 1.8  )  N
B)   (-1.1  + 1.8  )  N
C)   (-1.1  - 1.8  )  N
D)   (+1.8  - 1.1  )  N
E)   (-1.8  + 1.1  )  NF) D) and E)
G) C) and D)

Question 8

A long straight very thin wire on the y-axis carries a 10-A current in the positive y-direction. A circular loop 0.50 m in radius, also of very thin wire and lying in the yz-plane, carries a 9.0-A current, as shown. Point P is on the positive x-axis, at a distance of 0.50 m from the center of the loop. What is the magnetic field vector at point P due to these two currents? (μ0 = 4π × 10-7 T ∙ m/A)  0 = 4π × 10-7 T ∙ m/A)    A)  zero B)  -8.0 × 10-6 T   C)  (+4.0 × 10-6 T)    - (4.0 × 10-6 T)    D)  (-4.0 × 10-6 T)    - (4.0 × 10-6 T)    E)  (-4.0 × 10-6 T)    - (8.0 × 10-6 T)   " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   zero
B)   -8.0 × 10-6 T 0 = 4π × 10-7 T ∙ m/
A)     
A)   zero 
B)   -8.0 × 10-6 T   
C)   (+4.0 × 10-6 T)    - (4.0 × 10-6 T)    
D)   (-4.0 × 10-6 T)    - (4.0 × 10-6 T)    
E)   (-4.0 × 10-6 T)    - (8.0 × 10-6 T)   " class="answers-bank-image d-inline" rel="preload" >
C)   (+4.0 × 10-6 T)  0 = 4π × 10-7 T ∙ m/
A)     
A)   zero 
B)   -8.0 × 10-6 T   
C)   (+4.0 × 10-6 T)    - (4.0 × 10-6 T)    
D)   (-4.0 × 10-6 T)    - (4.0 × 10-6 T)    
E)   (-4.0 × 10-6 T)    - (8.0 × 10-6 T)   " class="answers-bank-image d-inline" rel="preload" > - (4.0 × 10-6 T)  0 = 4π × 10-7 T ∙ m/
A)     
A)   zero 
B)   -8.0 × 10-6 T   
C)   (+4.0 × 10-6 T)    - (4.0 × 10-6 T)    
D)   (-4.0 × 10-6 T)    - (4.0 × 10-6 T)    
E)   (-4.0 × 10-6 T)    - (8.0 × 10-6 T)   " class="answers-bank-image d-inline" rel="preload" >
D)   (-4.0 × 10-6 T)  0 = 4π × 10-7 T ∙ m/
A)     
A)   zero 
B)   -8.0 × 10-6 T   
C)   (+4.0 × 10-6 T)    - (4.0 × 10-6 T)    
D)   (-4.0 × 10-6 T)    - (4.0 × 10-6 T)    
E)   (-4.0 × 10-6 T)    - (8.0 × 10-6 T)   " class="answers-bank-image d-inline" rel="preload" > - (4.0 × 10-6 T)  0 = 4π × 10-7 T ∙ m/
A)     
A)   zero 
B)   -8.0 × 10-6 T   
C)   (+4.0 × 10-6 T)    - (4.0 × 10-6 T)    
D)   (-4.0 × 10-6 T)    - (4.0 × 10-6 T)    
E)   (-4.0 × 10-6 T)    - (8.0 × 10-6 T)   " class="answers-bank-image d-inline" rel="preload" >
E)   (-4.0 × 10-6 T)  0 = 4π × 10-7 T ∙ m/
A)     
A)   zero 
B)   -8.0 × 10-6 T   
C)   (+4.0 × 10-6 T)    - (4.0 × 10-6 T)    
D)   (-4.0 × 10-6 T)    - (4.0 × 10-6 T)    
E)   (-4.0 × 10-6 T)    - (8.0 × 10-6 T)   " class="answers-bank-image d-inline" rel="preload" > - (8.0 × 10-6 T)  0 = 4π × 10-7 T ∙ m/
A)     
A)   zero 
B)   -8.0 × 10-6 T   
C)   (+4.0 × 10-6 T)    - (4.0 × 10-6 T)    
D)   (-4.0 × 10-6 T)    - (4.0 × 10-6 T)    
E)   (-4.0 × 10-6 T)    - (8.0 × 10-6 T)   " class="answers-bank-image d-inline" rel="preload" >F) C) and D)
G) C) and E)

Question 9

Ions having equal charges but masses of M and 2M are accelerated through the same potential difference and then enter a uniform magnetic field perpendicular to their path. If the heavier ions follow a circular arc of radius R, what is the radius of the arc followed by the lighter?

Accepted Answer

A)   4R
B)   3R
C)    R
D)   R/ 
E)   R/2F) None of the above
G) B) and E)

Question 10

Two long parallel wires carry currents of 10 A in opposite directions. They are separated by 40 cm. What is the magnitude of the magnetic field in the plane of the wires at a point that is 20 cm from one wire and 60 cm from the other? (μ0 = 4π × 10-7 T ∙ m/A)

Accepted Answer

A)   1.5 µT
B)   3.3 µT
C)   6.7 µT
D)   33 µT
E)   67 µTF) A) and E)
G) C) and E)

Question 11

A cylindrical insulated wire of diameter 5.0 mm is tightly wound 200 times around a cylindrical core to form a solenoid with adjacent coils touching each other. When a 0.10 A current is sent through the wire, what is the magnitude of the magnetic field on the axis of the solenoid near its center? (μ0 = 4π × 10-7 T ∙ m/A)

Accepted Answer

A)   6.6 × 10-5 T
B)   2.5 × 10-5 T
C)   1.3 × 10-5 T
D)   3.6 × 10-5 T
E)   9.8 × 10-5 TF) B) and D)
G) B) and E)

Question 12

A doubly charged ion (charge 2e)  with velocity 6.9 × 106 m/s moves in a circular path of diameter 60.0 cm in a magnetic field of 0.80 T in a mass spectrometer. What is the mass of this ion? (e = 1.60 × 10-19C)

Accepted Answer

A)   11 × 10-27 kg
B)   6.7 × 10-27 kg
C)   4.5 × 10-27 kg
D)   3.3 × 10-27 kgE) A) and D)
F) A) and C)

Question 13

A solenoid is wound with 970 turns on a form 4.0 cm in diameter and 50 cm long. The windings carry a current I in the sense that is shown in the figure. The current produces a magnetic field, of magnitude 4.3 mT, near the center of the solenoid. Find the current in the solenoid windings. (μ0 = 4π × 10-7 T ∙ m/A)  0 = 4π × 10-7 T ∙ m/A)    A)  1.8 A B)  1.5 A C)  1.3 A D)  2.2 A E)  2.0 A" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   1.8 A
B)   1.5 A
C)   1.3 A
D)   2.2 A
E)   2.0 AF) C) and D)
G) C) and E)

Question 14

Two coaxial circular coils of radius R = 15 cm, each carrying 4.0 A in the same direction, are positioned a distance d = 20 cm apart, as shown in the figure. Calculate the magnitude of the magnetic field halfway between the coils along the line connecting their centers. (μ0 = 4π × 10-7 T ∙ m/A)  0 = 4π × 10-7 T ∙ m/A)    A)  0.90 × 10-5 T B)  3.9 × 10-5 T C)  1.9 × 10-5 T D)  6.3 × 10-5 T E)  9.2 × 10-5 T" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   0.90 × 10-5 T
B)   3.9 × 10-5 T
C)   1.9 × 10-5 T
D)   6.3 × 10-5 T
E)   9.2 × 10-5 TF) B) and E)
G) B) and D)

Question 15

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) B) and D)
G) All of the above

Question 16

A very long, solid, conducting cylinder of radius R carries a current along its length uniformly distributed throughout the cylinder. 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) All of the above
G) A) and D)

Question 17

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

Question 18

A circular coil of wire of 200 turns and diameter 2.0 cm carries a current of 4.0 A. It is placed in a magnetic field of 0.70 T with the plane of the coil making an angle of 30° with the magnetic field. What is the magnetic torque on the coil?

Accepted Answer

A)   0.15 N ∙ m
B)   0.088 N ∙ m
C)   0.29 N ∙ m
D)   0.40 N ∙ m
E)   0.076 N ∙ mF) C) and E)
G) D) and E)

Question 19

A wire carrying a current is shaped in the form of a circular loop of radius 3.0 mm. If the magnetic field strength that this current produces at the center of the loop is 1.1 mT, what is the magnitude of the current that flows through the wire? (μ0 = 4π × 10-7 T ∙ m/A)

Accepted Answer

A)   5.3 A
B)   16 A
C)   9.1 A
D)   23 AE) B) and C)
F) A) and B)

Question 20

A rigid rectangular loop, which measures 0.30 m by 0.40 m, carries a current of 5.5 A, as shown in the figure. A uniform external magnetic field of magnitude 2.9 T in the negative x direction is present. Segment CD is in the xz-plane and forms a 35° angle with the z-axis, as shown. Find the magnitude of the external torque needed to keep the loop in static equilibrium.

Accepted Answer

A)   1.1 N ∙ m
B)   0.73 N ∙ m
C)   1.3 N ∙ m
D)   1.4 N ∙ m
E)   1.6 N ∙ mF) A) and E)
G) None of the above

Exam 32: The Magnetic Field

A doubly charged ion (charge 2e) with velocity 6.9 × 10⁶ m/s moves in a circular path of diameter 60.0 cm in a magnetic field of 0.80 T in a mass spectrometer. What is the mass of this ion? (e = 1.60 × 10^-19C)

Correct Answer
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Correct Answer
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Correct Answer
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A particle with charge -5.00 C initially moves at = (1.00 + 7.00 ) m/s. If it encounters a magnetic field Find the magnetic force vector on the particle.

Correct Answer
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A very long thin wire produces a magnetic field of 0.0050 × 10^-4 T at a distance of 3.0 mm. from the central axis of the wire. What is the magnitude of the current in the wire? (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
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Correct Answer
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Correct Answer
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A circular coil of wire of 200 turns and diameter 2.0 cm carries a current of 4.0 A. It is placed in a magnetic field of 0.70 T with the plane of the coil making an angle of 30° with the magnetic field. What is the magnetic torque on the coil?

Correct Answer
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Ions having equal charges but masses of M and 2M are accelerated through the same potential difference and then enter a uniform magnetic field perpendicular to their path. If the heavier ions follow a circular arc of radius R, what is the radius of the arc followed by the lighter?

Correct Answer
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A charged particle is moving with speed v perpendicular to a uniform magnetic field. A second identical charged particle is moving with speed 2v perpendicular to the same magnetic field. If the frequency of revolution of the first particle is f, the frequency of revolution of the second particle is

Correct Answer
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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
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A wire carrying a current is shaped in the form of a circular loop of radius 3.0 mm. If the magnetic field strength that this current produces at the center of the loop is 1.1 mT, what is the magnitude of the current that flows through the wire? (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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0.010 T, +...
View Answer

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

Correct Answer
verified

Two long parallel wires carry currents of 10 A in opposite directions. They are separated by 40 cm. What is the magnitude of the magnetic field in the plane of the wires at a point that is 20 cm from one wire and 60 cm from the other? (μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
verified

Exam 32: The Magnetic Field

A doubly charged ion (charge 2e) with velocity 6.9 × 106 m/s moves in a circular path of diameter 60.0 cm in a magnetic field of 0.80 T in a mass spectrometer. What is the mass of this ion? (e = 1.60 × 10-19C)

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A particle with charge -5.00 C initially moves at = (1.00 + 7.00 ) m/s. If it encounters a magnetic field Find the magnetic force vector on the particle.

Correct AnswerverifiedShow Answer

A very long thin wire produces a magnetic field of 0.0050 × 10-4 T at a distance of 3.0 mm. from the central axis of the wire. What is the magnitude of the current in the wire? (μ0 = 4π × 10-7 T ∙ m/A)

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A circular coil of wire of 200 turns and diameter 2.0 cm carries a current of 4.0 A. It is placed in a magnetic field of 0.70 T with the plane of the coil making an angle of 30° with the magnetic field. What is the magnetic torque on the coil?

Correct AnswerverifiedShow Answer

Ions having equal charges but masses of M and 2M are accelerated through the same potential difference and then enter a uniform magnetic field perpendicular to their path. If the heavier ions follow a circular arc of radius R, what is the radius of the arc followed by the lighter?

Correct AnswerverifiedShow Answer

A charged particle is moving with speed v perpendicular to a uniform magnetic field. A second identical charged particle is moving with speed 2v perpendicular to the same magnetic field. If the frequency of revolution of the first particle is f, the frequency of revolution of the second particle is

Correct AnswerverifiedShow 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

A wire carrying a current is shaped in the form of a circular loop of radius 3.0 mm. If the magnetic field strength that this current produces at the center of the loop is 1.1 mT, what is the magnitude of the current that flows through the wire? (μ0 = 4π × 10-7 T ∙ m/A)

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct Answerverified0.010 T, +...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

Two long parallel wires carry currents of 10 A in opposite directions. They are separated by 40 cm. What is the magnitude of the magnetic field in the plane of the wires at a point that is 20 cm from one wire and 60 cm from the other? (μ0 = 4π × 10-7 T ∙ m/A)

Correct AnswerverifiedShow Answer

A doubly charged ion (charge 2e) with velocity 6.9 × 10⁶ m/s moves in a circular path of diameter 60.0 cm in a magnetic field of 0.80 T in a mass spectrometer. What is the mass of this ion? (e = 1.60 × 10^-19C)

Correct Answer
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Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A very long thin wire produces a magnetic field of 0.0050 × 10^-4 T at a distance of 3.0 mm. from the central axis of the wire. What is the magnitude of the current in the wire? (μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
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Correct Answer
verified

Correct Answer
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Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
verified

Correct Answer
verified

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

A wire carrying a current is shaped in the form of a circular loop of radius 3.0 mm. If the magnetic field strength that this current produces at the center of the loop is 1.1 mT, what is the magnitude of the current that flows through the wire? (μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
0.010 T, +...
View Answer

Correct Answer
verified

Two long parallel wires carry currents of 10 A in opposite directions. They are separated by 40 cm. What is the magnitude of the magnetic field in the plane of the wires at a point that is 20 cm from one wire and 60 cm from the other? (μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
verified