Question 1

A horizontal wire carries a current straight toward you. From your point of view, the magnetic field caused by this current

Accepted Answer

A)   points directly away from you.
B)   points to the left.
C)   circles the wire in a clockwise direction.
D)   circles the wire in a counter-clockwise direction.E) All of the above
F) A) and D)

Question 2

A proton, with mass 1.67 × 10-27 kg and charge +1.6 × 10-19 C, is sent with velocity $2.3\times 10^4 \mathrm {~m} / \mathrm { s }$ in the +x direction into a region where there is a uniform electric field of magnitude 780 $ {~V} / \mathrm { m }$ in the +y direction. What must be 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

Question 3

A rectangular coil, with corners labeled ABCD, has length L and width w. It is placed between the poles of a magnet, as shown in the figure If there is a current I flowing through this coil in the direction shown, what is the direction of the force acting on section AB of this coil?

Accepted Answer

A)   perpendicular to and into the page
B)   perpendicular to and out of the page
C)   in the direction of the magnetic field
D)   in the opposite direction of the magnetic field
E)   The force is zero.F) A) and E)
G) B) and C)

Question 4

A proton is to orbit Earth at the equator using Earth's magnetic field to supply part of the necessary centripetal force. In what direction should the proton move?

Accepted Answer

A)   upward
B)   northward
C)   southward
D)   eastward
E)   westwardF) All of the above
G) A) and C)

Question 5

A flat rectangular loop of wire carrying a 4.0-A current is placed in a uniform 0.60-T magnetic field. The magnitude of the torque acting on this loop when the plane of the loop makes a 30° angle with the field is measured to be 1.1 N ∙ m. What is the area of this loop?

Accepted Answer

A)   0.20 m2
B)   0.40 m2
C)   0.26 m2
D)   0.80 m2
E)   0.53 m2F) B) and E)
G) A) and B)

Question 6

An ideal solenoid that is 34.0 cm long is carrying a current of 2.00 A. If the magnitude of the magnetic field generated at the center of the solenoid is 9.00 mT, how many turns of wire does this solenoid contain? 
(μ0 = 4π × 10-7 T ∙ m/A)

Accepted Answer

A)   860
B)   1590
C)   2320
D)   3180
E)   1220F) A) and E)
G) A) and D)

Question 7

How many turns should a 10-cm long ideal solenoid have if it is to generate a 1.5-mT magnetic field when 1.0 A of current runs through it? 
(μ0 = 4π × 10-7 T ∙ m/A)

Accepted Answer

A)   12
B)   15
C)   120
D)   1200
E)   3200F) A) and E)
G) C) and D)

Question 8

A rigid rectangular loop, measuring 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 -x direction is present. Segment CD is in the xz-plane and forms a 35° angle with the z-axis, as shown. What is the magnitude of the torque that the magnetic field exerts on the loop?

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) B) and E)

Question 9

A flat rectangular loop of wire is placed between the poles of a magnet, as shown in the figure. It has dimensions w = 0.60 m and L = 1.0 m, and carries a current I = 2.0 A in the direction shown. The magnetic field due to the magnet is uniform and of magnitude 0.80 T. The loop rotates in the magnetic field and at one point the plane of the loop is parallel to the field. At that instant, what is the magnitude of the torque acting on the wire due to the magnetic field?

Accepted Answer

A)   0.00 N ∙ m
B)   0.40 N ∙ m
C)   0.48 N ∙ m
D)   0.83 N ∙ m
E)   0.96 N ∙ mF) B) and D)
G) A) and E)

Question 10

The direction of the force on a current-carrying wire in a magnetic field is

Accepted Answer

A)   perpendicular only to the current.
B)   perpendicular only to the magnetic field.
C)   perpendicular to both the current and the magnetic field.
D)   in the direction opposite to the current.
E)   in same direction as the current.F) A) and D)
G) A) and C)

Question 11

Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions. The wires are separated by 0.20 m. What is the strength of the magnetic field midway between the two wires? (μ0 = 4π × 10-7 T ∙ m/A)

Accepted Answer

A)   1.0 × 10-5 T
B)   2.0 × 10-5 T
C)   3.0 × 10-5 T
D)   4.0 × 10-5 T
E)   5.0 × 10-5 TF) All of the above
G) A) and B)

Question 12

An electron moving perpendicular to a uniform magnetic field of 3.2 × 10-2 T moves in a circle of radius 0.40 cm. How fast is this electron moving? 
(e = 1.60 × 10-19 C, melectron = 9.11 × 10-31kg)

Accepted Answer

A)   2.2 × 107 m/s
B)   1.9 × 107 m/s
C)   1.9 × 106 m/s
D)   3.0 × 107 m/s
E)   0.80 × 107 m/sF) A) and B)
G) A) and E)

Question 13

What is the force per meter on a straight wire carrying 5.0 A when it is placed in a magnetic field of 0.020 T so that the wire makes an angle of 27° with respect to the magnetic field lines.

Accepted Answer

A)   0.022 N/m
B)   0.045 N/m
C)   0.17 N/m
D)   0.26 N/mE) All of the above
F) C) and D)

Question 14

A long, straight, horizontal wire carries current toward the east. An electron moves toward the east alongside and just south of the wire. What is the direction of the magnetic force on the electron?

Accepted Answer

A)   toward the north
B)   toward the south
C)   upward
D)   downward
E)   toward the westF) None of the above
G) B) and E)

Question 15

A very long straight current-carrying wire produces a magnetic field of 20 mT at a distance d from the wire. To measure a field of 5 mT due to this wire, you would have to go to a distance from the wire of

Accepted Answer

A)   16d.
B)   8d.
C)   4d.
D)   2d.
E)   d  2\sqrt { 2 }2c-2.7,0,-7.17,-2.7,-13.5,-8c-5.8,-5.3,-9.5,-10,-9.5,-14c0,-2,0.3,-3.3,1,-4c1.3,-2.7,23.83,-20.7,67.5,-54c44.2,-33.3,65.8,-50.3,66.5,-51c1.3,-1.3,3,-2,5,-2c4.7,0,8.7,3.3,12,10s173,378,173,378c0.7,0,35.3,-71,104,-213c68.7,-142,137.5,-285,206.5,-429c69,-144,104.5,-217.7,106.5,-221l0 -0c5.3,-9.3,12,-14,20,-14H400000v40H845.2724s-225.272,467,-225.272,467s-235,486,-235,486c-2.7,4.7,-9,7,-19,7c-6,0,-10,-1,-12,-3s-194,-422,-194,-422s-65,47,-65,47zM834 80h400000v40h-400000z'/>​F) None of the above
G) A) and E)

Question 16

A charged particle moving along the +x-axis enters a uniform magnetic field pointing along the +z-axis. A uniform electric field is also present. Due to the combined effect of both fields, the particle does not change its velocity. What is the direction of the electric field?

Accepted Answer

A)   along the -y-axis
B)   along the +y-axis
C)   along the -x-axis
D)   along the +x-axis
E)   along the -z-axisF) A) and B)
G) A) and C)

Question 17

A proton is projected with a velocity of 7.0 km/s into a magnetic field of 0.60 T perpendicular to the motion of the proton. What is the magnitude of the magnetic force that acts on the proton? (e = 1.60 × 10-19C)

Accepted Answer

A)   0 N
B)   3.4 × 10-16 N
C)   4.2 × 10-16 N
D)   13 × 10-16 N
E)   6.7 × 10-16 NF) B) and C)
G) A) and D)

Question 18

A proton has an initial velocity to the south but is observed to curve upward as the result of a magnetic field. This magnetic field must have a component

Accepted Answer

A)   to the west.
B)   to the east.
C)   upward.
D)   downward.
E)   to the north.F) C) and E)
G) A) and B)

Question 19

A flat circular coil of wire having 200 turns and diameter 6.0 cm carries a current of 7.0 A. It is placed in a magnetic field of  0.60 T0.60 \mathrm {~T}0.60 T  with the plane of the coil making an angle of 30° with the magnetic field. What is the magnitude of the magnetic torque on the coil?

Accepted Answer

A)   2.1 N ∙ m
B)   1.2 N ∙ m
C)   3.9 N ∙ m
D)   5.4 N ∙ m
E)   1.0 N ∙ m F) B) and E)
G) B) and D)

Question 20

A charged particle moving along the +x-axis enters a uniform magnetic field pointing along the +z-axis. Because of an electric field along the +y-axis, the charge particle does not change velocity. What is the sign of this particle?

Accepted Answer

A)   positive
B)   negative
C)   The particle could be either positive or negative.
D)   None of the above choices is correct.E) C) and D)
F) A) and B)

Exam 24: Magnetic Fields and Forces

A very long straight current-carrying wire produces a magnetic field of 20 mT at a distance d from the wire. To measure a field of 5 mT due to this wire, you would have to go to a distance from the wire of

Correct Answer
verified

A rectangular coil, with corners labeled ABCD, has length L and width w. It is placed between the poles of a magnet, as shown in the figure If there is a current I flowing through this coil in the direction shown, what is the direction of the force acting on section AB of this coil?

Correct Answer
verified

An ideal solenoid that is 34.0 cm long is carrying a current of 2.00 A. If the magnitude of the magnetic field generated at the center of the solenoid is 9.00 mT, how many turns of wire does this solenoid contain? (μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
verified

A charged particle moving along the +x-axis enters a uniform magnetic field pointing along the +z-axis. A uniform electric field is also present. Due to the combined effect of both fields, the particle does not change its velocity. What is the direction of the electric field?

Correct Answer
verified

A flat circular coil of wire having 200 turns and diameter 6.0 cm carries a current of 7.0 A. It is placed in a magnetic field of $0.60 \mathrm {~T}$ with the plane of the coil making an angle of 30° with the magnetic field. What is the magnitude of the magnetic torque on the coil?

Correct Answer
verified

What is the force per meter on a straight wire carrying 5.0 A when it is placed in a magnetic field of 0.020 T so that the wire makes an angle of 27° with respect to the magnetic field lines.

Correct Answer
verified

A proton is to orbit Earth at the equator using Earth's magnetic field to supply part of the necessary centripetal force. In what direction should the proton move?

Correct Answer
verified

Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions. The wires are separated by 0.20 m. What is the strength of the magnetic field midway between the two wires? (μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
verified

A flat rectangular loop of wire carrying a 4.0-A current is placed in a uniform 0.60-T magnetic field. The magnitude of the torque acting on this loop when the plane of the loop makes a 30° angle with the field is measured to be 1.1 N ∙ m. What is the area of this loop?

Correct Answer
verified

A long, straight, horizontal wire carries current toward the east. An electron moves toward the east alongside and just south of the wire. What is the direction of the magnetic force on the electron?

Correct Answer
verified

A horizontal wire carries a current straight toward you. From your point of view, the magnetic field caused by this current

Correct Answer
verified

Correct Answer
verified

A proton is projected with a velocity of 7.0 km/s into a magnetic field of 0.60 T perpendicular to the motion of the proton. What is the magnitude of the magnetic force that acts on the proton? (e = 1.60 × 10^-19C)

Correct Answer
verified

An electron moving perpendicular to a uniform magnetic field of 3.2 × 10^-2 T moves in a circle of radius 0.40 cm. How fast is this electron moving? (e = 1.60 × 10^-19 C, m_electron = 9.11 × 10^-31kg)

Correct Answer
verified

A proton has an initial velocity to the south but is observed to curve upward as the result of a magnetic field. This magnetic field must have a component

Correct Answer
verified

A charged particle moving along the +x-axis enters a uniform magnetic field pointing along the +z-axis. Because of an electric field along the +y-axis, the charge particle does not change velocity. What is the sign of this particle?

Correct Answer
verified

How many turns should a 10-cm long ideal solenoid have if it is to generate a 1.5-mT magnetic field when 1.0 A of current runs through it? (μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
verified

The direction of the force on a current-carrying wire in a magnetic field is

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Exam 24: Magnetic Fields and Forces

A very long straight current-carrying wire produces a magnetic field of 20 mT at a distance d from the wire. To measure a field of 5 mT due to this wire, you would have to go to a distance from the wire of

Correct AnswerverifiedShow Answer

A rectangular coil, with corners labeled ABCD, has length L and width w. It is placed between the poles of a magnet, as shown in the figure If there is a current I flowing through this coil in the direction shown, what is the direction of the force acting on section AB of this coil?

Correct AnswerverifiedShow Answer

An ideal solenoid that is 34.0 cm long is carrying a current of 2.00 A. If the magnitude of the magnetic field generated at the center of the solenoid is 9.00 mT, how many turns of wire does this solenoid contain? (μ0 = 4π × 10-7 T ∙ m/A)

Correct AnswerverifiedShow Answer

A charged particle moving along the +x-axis enters a uniform magnetic field pointing along the +z-axis. A uniform electric field is also present. Due to the combined effect of both fields, the particle does not change its velocity. What is the direction of the electric field?

Correct AnswerverifiedShow Answer

A flat circular coil of wire having 200 turns and diameter 6.0 cm carries a current of 7.0 A. It is placed in a magnetic field of 0.60 T0.60 \mathrm {~T}0.60 T with the plane of the coil making an angle of 30° with the magnetic field. What is the magnitude of the magnetic torque on the coil?

Correct AnswerverifiedShow Answer

What is the force per meter on a straight wire carrying 5.0 A when it is placed in a magnetic field of 0.020 T so that the wire makes an angle of 27° with respect to the magnetic field lines.

Correct AnswerverifiedShow Answer

A proton is to orbit Earth at the equator using Earth's magnetic field to supply part of the necessary centripetal force. In what direction should the proton move?

Correct AnswerverifiedShow Answer

Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions. The wires are separated by 0.20 m. What is the strength of the magnetic field midway between the two wires? (μ0 = 4π × 10-7 T ∙ m/A)

Correct AnswerverifiedShow Answer

A flat rectangular loop of wire carrying a 4.0-A current is placed in a uniform 0.60-T magnetic field. The magnitude of the torque acting on this loop when the plane of the loop makes a 30° angle with the field is measured to be 1.1 N ∙ m. What is the area of this loop?

Correct AnswerverifiedShow Answer

A long, straight, horizontal wire carries current toward the east. An electron moves toward the east alongside and just south of the wire. What is the direction of the magnetic force on the electron?

Correct AnswerverifiedShow Answer

A horizontal wire carries a current straight toward you. From your point of view, the magnetic field caused by this current

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A proton is projected with a velocity of 7.0 km/s into a magnetic field of 0.60 T perpendicular to the motion of the proton. What is the magnitude of the magnetic force that acts on the proton? (e = 1.60 × 10-19C)

Correct AnswerverifiedShow Answer

An electron moving perpendicular to a uniform magnetic field of 3.2 × 10-2 T moves in a circle of radius 0.40 cm. How fast is this electron moving? (e = 1.60 × 10-19 C, melectron = 9.11 × 10-31kg)

Correct AnswerverifiedShow Answer

A proton has an initial velocity to the south but is observed to curve upward as the result of a magnetic field. This magnetic field must have a component

Correct AnswerverifiedShow Answer

A charged particle moving along the +x-axis enters a uniform magnetic field pointing along the +z-axis. Because of an electric field along the +y-axis, the charge particle does not change velocity. What is the sign of this particle?

Correct AnswerverifiedShow Answer

How many turns should a 10-cm long ideal solenoid have if it is to generate a 1.5-mT magnetic field when 1.0 A of current runs through it? (μ0 = 4π × 10-7 T ∙ m/A)

Correct AnswerverifiedShow Answer

The direction of the force on a current-carrying wire in a magnetic field is

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
verified

An ideal solenoid that is 34.0 cm long is carrying a current of 2.00 A. If the magnitude of the magnetic field generated at the center of the solenoid is 9.00 mT, how many turns of wire does this solenoid contain? (μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
verified

Correct Answer
verified

A flat circular coil of wire having 200 turns and diameter 6.0 cm carries a current of 7.0 A. It is placed in a magnetic field of $0.60 \mathrm {~T}$ with the plane of the coil making an angle of 30° with the magnetic field. What is the magnitude of the magnetic torque on the coil?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions. The wires are separated by 0.20 m. What is the strength of the magnetic field midway between the two wires? (μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A proton is projected with a velocity of 7.0 km/s into a magnetic field of 0.60 T perpendicular to the motion of the proton. What is the magnitude of the magnetic force that acts on the proton? (e = 1.60 × 10^-19C)

Correct Answer
verified

An electron moving perpendicular to a uniform magnetic field of 3.2 × 10^-2 T moves in a circle of radius 0.40 cm. How fast is this electron moving? (e = 1.60 × 10^-19 C, m_electron = 9.11 × 10^-31kg)

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

How many turns should a 10-cm long ideal solenoid have if it is to generate a 1.5-mT magnetic field when 1.0 A of current runs through it? (μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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