Question 1

In using a magnet to find north, the term "declination" represents

Accepted Answer

A)  the degree of weakness of the magnetic field.
B)  the angle above the horizontal of the earth's magnetic field.
C)  another term for "angle of dip."
D)  the angle below the horizontal of the earth's magnetic field.
E)  not givenF) A) and B)
G) A) and C)

Question 2

The force on a current-carrying wire in a magnetic field is equal to zero when

Accepted Answer

A)  the current is parallel to the field lines.
B)  the current is at a 30° angle with respect to the field lines.
C)  the current is at a 45° angle with respect to the field lines.
D)  the current is at a 60° angle with respect to the field lines.
E)  the current is perpendicular to the field lines.F) B) and D)
G) C) and E)

Question 3

A wire, 0.60 m in length, is carrying a current of 2.0 A and is placed at a certain angle with respect to the 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)  20°
B)  25°
C)  30°
D)  35°
E)  60°F) All of the above
G) B) and E)

Question 4

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. The frequency of revolution of the first particle is f. The frequency of revolution of the second particle is

Accepted Answer

A)  f.
B)  4f.
C)  f/2.
D)  f/4.
E)  2f.F) A) and C)
G) A) and E)

Question 5

A proton, moving east, enters a magnetic field of a certain strength. Because of this field the proton curves downward. What is the direction of the magnetic field?

Accepted Answer

A)  towards the south
B)  towards the north
C)  downward
D)  upward
E)  towards the westF) A) and E)
G) A) and D)

Question 6

A loop of diameter d = 12 cm, carrying a current I = 0.4 A is placed inside a magnetic field -4 J B) +9.0 × 10-4 J C) -9.0 × 10-4 J D) -2.3 × 10-4 J E) +4.5 × 10-4 J" class="answers-bank-image d-inline" rel="preload" > = (0.2 T)  -4 J B) +9.0 × 10-4 J C) -9.0 × 10-4 J D) -2.3 × 10-4 J E) +4.5 × 10-4 J" class="answers-bank-image d-inline" rel="preload" > + (0.4 T)  -4 J B) +9.0 × 10-4 J C) -9.0 × 10-4 J D) -2.3 × 10-4 J E) +4.5 × 10-4 J" class="answers-bank-image d-inline" rel="preload" > . The normal to the loop is parallel to the unit vector -4 J B) +9.0 × 10-4 J C) -9.0 × 10-4 J D) -2.3 × 10-4 J E) +4.5 × 10-4 J" class="answers-bank-image d-inline" rel="preload" > . What is the potential energy of the loop?

Accepted Answer

A)  -4.5 × 10-4 J
B)  +9.0 × 10-4 J
C)  -9.0 × 10-4 J
D)  -2.3 × 10-4 J
E)  +4.5 × 10-4 JF) B) and C)
G) D) and E)

Question 7

A proton travels through a potential of 1.0 kV and then moves into a magnetic field of 0.040 T. What is the radius of the proton's resulting orbit?

Accepted Answer

A)  0.080 m
B)  0.11 m
C)  0.14 m
D)  0.17 m
E)  0.19 mF) D) and E)
G) B) and C) B

Question 8

A charged particle is injected into a uniform magnetic field such that its velocity vector is perpendicular to the magnetic field vector. Ignoring the particle's weight, the particle will

Accepted Answer

A)  move in a straight line.
B)  follow a spiral path.
C)  move along a parabolic path.
D)  move along a hyperbolic path.
E)  follow a circular path.F) A) and B)
G) C) and D) E

Question 9

An electron moves with a speed of 3.0 × 104 m/s perpendicular to a uniform magnetic field of 0.40 T. What is the magnitude of the magnetic force on the electron?

Accepted Answer

A)  4.8 × 10-14 N
B)  1.9 × 10-15 N
C)  5 × 10-20 N
D)  2.2 × 10-24 N
E)  zeroF) B) and D)
G) A) and E)

Question 10

A wire is carrying current vertically downward. What is the direction of the force due to Earth's magnetic field on the wire?

Accepted Answer

A)  horizontally towards the north
B)  horizontally towards the south
C)  horizontally towards the east
D)  horizontally towards the west
E)  vertically upwardF) C) and D)
G) A) and D) C

Question 11

In a Hall experiment a conducting strip of thickness d = 100 μm is placed in a magnetic field B = 0.0 5 T. The magnetic field is perpendicular to the direction of the strip along which there is a 10-A current. What is the Hall voltage measured across the strip if the charge carrier density is 2.5 × 1028/m3 in this material?

Accepted Answer

A)  1.3 μV
B)  2.5 μV
C)  0.72 μV
D)  6.2 μV
E)  4.2 μVF) A) and E)
G) A) and D)

Question 12

A proton is moving at a speed of 3.2 × 106 m/s at an angle of 80° to a uniform magnetic field of strength 1.5 × 10-4 T. What is the distance moved by the proton along the spiral path as it completes one revolution? (This distance is called the "pitch" of the helix.)

Accepted Answer

A)  1370 m
B)  1390 m
C)  240 m
D)  220 m
E)  cannot be determinedF) A) and C)
G) None of the above

Question 13

FIGURE 27-10 
-A horizontal, long current-carrying wire is hanging from a vertical thread. The current is oriented into the plane of Fig. 27-10 shown above. A uniform magnetic field B = 0.4 T is applied along the negative y-axis and the wire is pulled and angle θ away from the vertical by a magnetic force. The wire has a length L = 80 cm, a mass m = 50 g and carries a current I = 0.3A. What is the value of the angle θ?

Accepted Answer

A)  25°
B)  67°
C)  3°
D)  45°
E)  11°F) B) and D)
G) A) and D)

Question 14

An alpha particle is moving at a speed of 5 × 105 m/s in a direction perpendicular to a uniform magnetic field of strength 4 × 10-2 T. The charge on an alpha particle is 3.2 × 10-19 C and its mass is 6.6 × 10-27 kg. (a) The radius of the path of the alpha particle is
(b) The time it takes the alpha particle to complete one revolution around its path is

Accepted Answer

(a) 0.26 m...

Question 15

FIGURE 27-4 
-Three particles travel through a region of space where the magnetic field is out of the page, as shown in Fig. 27-4. The electric charge of each of the three particles is, respectively,

Accepted Answer

A)  1 is neutral, 2 is negative, and 3 is positive.
B)  1 is neutral, 2 is positive, and 3 is negative.
C)  1 is positive, 2 is neutral, and 3 is negative.
D)  1 is positive, 2 is negative, and 3 is neutral.
E)  1 is negative, 2 is neutral, and 3 is positive.F) B) and E)
G) B) and D)

Question 16

The direction of the force on a current-carrying wire in a magnetic field is described by which of the following?

Accepted Answer

A)  parallel to the current only
B)  parallel to the magnetic field only
C)  perpendicular to the current only
D)  perpendicular to the magnetic field only
E)  perpendicular to both the current and the magnetic fieldF) All of the above
G) A) and E)

Question 17

A 2-m long wire is carrying a current of 2 A. The wire is placed at an angle of 60° with respect to a magnetic field. If the wire experiences a force of 0.2 N, what is the strength of the magnetic field?

Accepted Answer

A)  0.02 T
B)  0.03 T
C)  0.04 T
D)  0.05 T
E)  0.06 TF) A) and D)
G) C) and E)

Question 18

A circular loop of wire of cross-sectional area 0.12 m2 consists of 200 turns, each carrying 0.50 A. It is placed in a magnetic field of 0.050 T oriented at 30° to the plane of the loop. What torque acts on the loop?

Accepted Answer

A)  0.25 m∙N
B)  0.52 m∙N
C)  2.5 m∙N
D)  5.2 m∙N
E)  25 m∙NF) D) and E)
G) A) and E)

Question 19

FIGURE 27-2 
-A horizontal, long current-carrying wire is hanging from a vertical thread. The current is oriented into the plane of Fig. 27-2 shown above. A uniform magnetic field is applied and the wire is pulled away from the vertical. Which of the arrows labeled A to D correctly indicate the direction of the magnetic field?

Accepted Answer

A)  A
B)  B
C)  C
D)  D
E)  The magnetic field is oriented into the plane of the picture.F) B) and E)
G) C) and D)

Question 20

The figure below shows 2 bar magnets of the same size and the same strength. Which of the arrows labeled A to D correctly represents the direction of the magnetic field at a point located at the common origin of the arrows? (That point is at an equal distance from the two magnets.)

Accepted Answer

A)  A
B)  B
C)  C
D)  D
E)  The field is oriented perpendicular to the figure into the page.F) A) and C)
G) C) and E)

Exam 27: Magnetism

In using a magnet to find north, the term "declination" represents

Correct Answer
verified

The force on a current-carrying wire in a magnetic field is equal to zero when

Correct Answer
verified

A wire, 0.60 m in length, is carrying a current of 2.0 A and is placed at a certain angle with respect to the 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
verified

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. The frequency of revolution of the first particle is f. The frequency of revolution of the second particle is

Correct Answer
verified

A proton, moving east, enters a magnetic field of a certain strength. Because of this field the proton curves downward. What is the direction of the magnetic field?

Correct Answer
verified

A loop of diameter d = 12 cm, carrying a current I = 0.4 A is placed inside a magnetic field = (0.2 T) + (0.4 T) . The normal to the loop is parallel to the unit vector . What is the potential energy of the loop?

Correct Answer
verified

A proton travels through a potential of 1.0 kV and then moves into a magnetic field of 0.040 T. What is the radius of the proton's resulting orbit?

Correct Answer
verified
B

A charged particle is injected into a uniform magnetic field such that its velocity vector is perpendicular to the magnetic field vector. Ignoring the particle's weight, the particle will

Correct Answer
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E

An electron moves with a speed of 3.0 × 10⁴ m/s perpendicular to a uniform magnetic field of 0.40 T. What is the magnitude of the magnetic force on the electron?

Correct Answer
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A wire is carrying current vertically downward. What is the direction of the force due to Earth's magnetic field on the wire?

Correct Answer
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C

Correct Answer
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A proton is moving at a speed of 3.2 × 10⁶ m/s at an angle of 80° to a uniform magnetic field of strength 1.5 × 10^-4 T. What is the distance moved by the proton along the spiral path as it completes one revolution? (This distance is called the "pitch" of the helix.)

Correct Answer
verified

Correct Answer
verified

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

FIGURE 27-4 -Three particles travel through a region of space where the magnetic field is out of the page, as shown in Fig. 27-4. The electric charge of each of the three particles is, respectively,

Correct Answer
verified

The direction of the force on a current-carrying wire in a magnetic field is described by which of the following?

Correct Answer
verified

A 2-m long wire is carrying a current of 2 A. The wire is placed at an angle of 60° with respect to a magnetic field. If the wire experiences a force of 0.2 N, what is the strength of the magnetic field?

Correct Answer
verified

A circular loop of wire of cross-sectional area 0.12 m² consists of 200 turns, each carrying 0.50 A. It is placed in a magnetic field of 0.050 T oriented at 30° to the plane of the loop. What torque acts on the loop?

Correct Answer
verified

Correct Answer
verified

The figure below shows 2 bar magnets of the same size and the same strength. Which of the arrows labeled A to D correctly represents the direction of the magnetic field at a point located at the common origin of the arrows? (That point is at an equal distance from the two magnets.)

Correct Answer
verified

Exam 27: Magnetism

In using a magnet to find north, the term "declination" represents

Correct AnswerverifiedShow Answer

The force on a current-carrying wire in a magnetic field is equal to zero when

Correct AnswerverifiedShow Answer

A wire, 0.60 m in length, is carrying a current of 2.0 A and is placed at a certain angle with respect to the 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

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. The frequency of revolution of the first particle is f. The frequency of revolution of the second particle is

Correct AnswerverifiedShow Answer

A proton, moving east, enters a magnetic field of a certain strength. Because of this field the proton curves downward. What is the direction of the magnetic field?

Correct AnswerverifiedShow Answer

A loop of diameter d = 12 cm, carrying a current I = 0.4 A is placed inside a magnetic field = (0.2 T) + (0.4 T) . The normal to the loop is parallel to the unit vector . What is the potential energy of the loop?

Correct AnswerverifiedShow Answer

A proton travels through a potential of 1.0 kV and then moves into a magnetic field of 0.040 T. What is the radius of the proton's resulting orbit?

Correct AnswerverifiedB

A charged particle is injected into a uniform magnetic field such that its velocity vector is perpendicular to the magnetic field vector. Ignoring the particle's weight, the particle will

Correct AnswerverifiedE

An electron moves with a speed of 3.0 × 104 m/s perpendicular to a uniform magnetic field of 0.40 T. What is the magnitude of the magnetic force on the electron?

Correct AnswerverifiedShow Answer

A wire is carrying current vertically downward. What is the direction of the force due to Earth's magnetic field on the wire?

Correct AnswerverifiedC

Correct AnswerverifiedShow Answer

A proton is moving at a speed of 3.2 × 106 m/s at an angle of 80° to a uniform magnetic field of strength 1.5 × 10-4 T. What is the distance moved by the proton along the spiral path as it completes one revolution? (This distance is called the "pitch" of the helix.)

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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

FIGURE 27-4 -Three particles travel through a region of space where the magnetic field is out of the page, as shown in Fig. 27-4. The electric charge of each of the three particles is, respectively,

Correct AnswerverifiedShow Answer

The direction of the force on a current-carrying wire in a magnetic field is described by which of the following?

Correct AnswerverifiedShow Answer

A 2-m long wire is carrying a current of 2 A. The wire is placed at an angle of 60° with respect to a magnetic field. If the wire experiences a force of 0.2 N, what is the strength of the magnetic field?

Correct AnswerverifiedShow Answer

A circular loop of wire of cross-sectional area 0.12 m2 consists of 200 turns, each carrying 0.50 A. It is placed in a magnetic field of 0.050 T oriented at 30° to the plane of the loop. What torque acts on the loop?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The figure below shows 2 bar magnets of the same size and the same strength. Which of the arrows labeled A to D correctly represents the direction of the magnetic field at a point located at the common origin of the arrows? (That point is at an equal distance from the two magnets.)

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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Correct Answer
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B

Correct Answer
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E

An electron moves with a speed of 3.0 × 10⁴ m/s perpendicular to a uniform magnetic field of 0.40 T. What is the magnitude of the magnetic force on the electron?

Correct Answer
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Correct Answer
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C

Correct Answer
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A proton is moving at a speed of 3.2 × 10⁶ m/s at an angle of 80° to a uniform magnetic field of strength 1.5 × 10^-4 T. What is the distance moved by the proton along the spiral path as it completes one revolution? (This distance is called the "pitch" of the helix.)

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A circular loop of wire of cross-sectional area 0.12 m² consists of 200 turns, each carrying 0.50 A. It is placed in a magnetic field of 0.050 T oriented at 30° to the plane of the loop. What torque acts on the loop?

Correct Answer
verified

Correct Answer
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Correct Answer
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