Question 1

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 directly toward you,and the wire on your left carries current directly away from you.From your point of view,the  B⃗\vec { B }B  field at a 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.

Question 2

At a point 10 m away from a long straight thin wire,the $\vec { B }$ field due to the wire is 0.10 mT.What is the current through the wire? (μ0 = 4π × 10-7 T ∙ m/A)

Accepted Answer

Question 3

A vertical wire carries a current vertically downward.To the east of this wire,the  B⃗\vec { B }B  field points

Accepted Answer

A)  north.
B)  east.
C)  south.
D)  down.

Question 4

At a particular instant,a proton moves toward the east in a uniform  B⃗\vec { B }B  field that is directed straight downward.The magnetic force exerted on it is

Accepted Answer

A)  zero.
B)  upward.
C)  toward the north.
D)  toward the south.
E)  downward.

Question 5

A proton is to orbit Earth at the equator using Earth's magnetic field to exert part of the necessary radial component of the sum of the forces.In what direction should the proton move?

Accepted Answer

A)  upward
B)  northward
C)  southward
D)  eastward
E)  westward

Question 6

A wire in the shape of an "M" lies in the plane of the paper.It carries a current of 2.0 A, from A to E,as shown in the figure.It is placed in a uniform magnetic 0.75-T  B⃗\vec { B }B  field in the same plane,directed as shown on the right side of the figure.The figure indicates the dimensions of the wire.Note that AB is parallel to DE and to the baseline from which the  B⃗\vec { B }B  field direction is measured.What are the magnitude and direction of the magnetic force exerted on section AB of this wire?

Accepted Answer

A)  0.20 N perpendicular out of the page
B)  0.40 N perpendicular out of the page
C)  0.11 N perpendicular out of the page
D)  0.20 N perpendicular into the page
E)  0.11 N perpendicular into the page

Question 7

A charged particle of mass 0.0040 kg is enters a  4.0−14.0 - 14.0−1  magnetic field with the direction of the field vector at a right angle to its motion.If the particle moves in a circle of radius  0.10 m0.10 \mathrm {~m}0.10 m  at a speed of  2.0 m/s2.0 \mathrm {~m} / \mathrm { s }2.0 m/s  what is the magnitude of the charge on the particle?

Accepted Answer

A)  0.020 C
B)  50 C
C)  0.00040 C
D)  2500 C

Question 8

A straight wire carries a current of 10 A at an angle of 30° with respect to the direction of a uniform 0.30-T  B⃗\vec { B }B  field.Find the magnitude of the magnetic force exerted on a 0.50-m length of the wire.

Accepted Answer

A)  0.75 N
B)  1.5 N
C)  3.0 N
D)  6.0 N

Question 9

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

Accepted Answer

A)  perpendicular only to the current.
B)  perpendicular only to the  B⃗\vec { B }B3.333 2.667 6.667 9 10 19 6.667 24.667 20.333 43.667 41 57 7.333 4.667 1110.667 11 18 0 6-1 10-3 12s-6.667 5-14 9c-28.667 14.667-53.667 35.667-75 63-1.333 1.333-3.167 3.5-5.5 6.5s-4 4.833-5 5.5c-1 .667-2.5 1.333-4.5 2s-4.333 1-7 1c-4.667 0-9.167-1.833-13.5-5.5S337 184 337 178c0-12.667 15.667-32.333 47-59H213l-171-1c-8.667-6-13-12.333-13-19 0-4.667 4.333-11.333 13-20h359c-16-25.333-24-45-24-59z'/>  field.
C)  perpendicular to both the current and the  B⃗\vec { B }B3.333 2.667 6.667 9 10 19 6.667 24.667 20.333 43.667 41 57 7.333 4.667 1110.667 11 18 0 6-1 10-3 12s-6.667 5-14 9c-28.667 14.667-53.667 35.667-75 63-1.333 1.333-3.167 3.5-5.5 6.5s-4 4.833-5 5.5c-1 .667-2.5 1.333-4.5 2s-4.333 1-7 1c-4.667 0-9.167-1.833-13.5-5.5S337 184 337 178c0-12.667 15.667-32.333 47-59H213l-171-1c-8.667-6-13-12.333-13-19 0-4.667 4.333-11.333 13-20h359c-16-25.333-24-45-24-59z'/>  field.
D)  in the direction opposite to the current.
E)  in same direction as the current.

Question 10

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 magnitude of the  B⃗\vec { B }B  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 T

Question 11

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 A to E.It is placed in a uniform 0.85-T  B⃗\vec { B }B  field in the same plane,directed as shown on the right side of the figure.The figure indicates the dimensions of the wire.Note that AB is parallel to DE and to the baseline from which the  B⃗\vec { B }B  field direction is measured.What are the magnitude and direction of the net magnetic force exerted on this wire?

Accepted Answer

A)  0.40 N perpendicular out of the page
B)  0.10 N perpendicular into the page
C)  0.40 N perpendicular into the page
D)  0.10 N perpendicular out of the page
E)  0.20 N perpendicular out of the page

Question 12

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 through this coil in the direction shown,what is the direction of the force exerted on section BC 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  B⃗\vec { B }B3.333 2.667 6.667 9 10 19 6.667 24.667 20.333 43.667 41 57 7.333 4.667 1110.667 11 18 0 6-1 10-3 12s-6.667 5-14 9c-28.667 14.667-53.667 35.667-75 63-1.333 1.333-3.167 3.5-5.5 6.5s-4 4.833-5 5.5c-1 .667-2.5 1.333-4.5 2s-4.333 1-7 1c-4.667 0-9.167-1.833-13.5-5.5S337 184 337 178c0-12.667 15.667-32.333 47-59H213l-171-1c-8.667-6-13-12.333-13-19 0-4.667 4.333-11.333 13-20h359c-16-25.333-24-45-24-59z'/>  field
D)  in the opposite direction of the  B⃗\vec { B }B3.333 2.667 6.667 9 10 19 6.667 24.667 20.333 43.667 41 57 7.333 4.667 1110.667 11 18 0 6-1 10-3 12s-6.667 5-14 9c-28.667 14.667-53.667 35.667-75 63-1.333 1.333-3.167 3.5-5.5 6.5s-4 4.833-5 5.5c-1 .667-2.5 1.333-4.5 2s-4.333 1-7 1c-4.667 0-9.167-1.833-13.5-5.5S337 184 337 178c0-12.667 15.667-32.333 47-59H213l-171-1c-8.667-6-13-12.333-13-19 0-4.667 4.333-11.333 13-20h359c-16-25.333-24-45-24-59z'/>  field
E)  The force is zero.

Question 13

A flat circular wire loop of area 0.25 m2 carries a current of 5.0 A.This coil lies on a horizontal table with the current flowing in the counterclockwise direction when viewed from above.At this point,Earth's  B⃗\vec { B }B  field is 1.2 × 10-5 T directed 60° below the horizontal.What is the magnitude of the torque that Earth's magnetic field exerts on this loop?

Accepted Answer

A)  2.5 × 10-6 N ∙ m
B)  5.0 × 10-6 N ∙ m
C)  7.5 × 10-6 N ∙ m
D)  1.0 × 10-5 N ∙ m

Question 14

An electron has an initial velocity to the south but is observed to curve upward as the result of a magnetic field.This  B⃗\vec { B }B  field must have a component

Accepted Answer

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

Question 15

An electron is accelerated from rest through a potential difference of 3.75 kV.It enters a region where a uniform 4.0-mT  B⃗\vec { B }B  field is perpendicular to the velocity of the electron.Calculate the radius of the path this electron will follow in the magnetic field.(e = 1.60 × 10-19 C,melectron = 9.11 × 10-31 kg)

Accepted Answer

A)  1.2 cm
B)  2.2 cm
C)  3.2 cm
D)  4.2 cm
E)  5.2 cm

Question 16

A proton,moving north,enters a magnetic field.Because of this field,the proton curves downward.We may conclude that the  B⃗\vec { B }B  field must have a component

Accepted Answer

A)  downward.
B)  upward.
C)  towards the east.
D)  towards the west.
E)  towards the north.

Exam 18: Magnetism

Correct Answer
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Correct Answer
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Correct Answer
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A proton,moving north,enters a magnetic field.Because of this field,the proton curves downward.We may conclude that the $\vec { B }$ field must have a component

Correct Answer
verified

At a particular instant,a proton moves toward the east in a uniform $\vec { B }$ field that is directed straight downward.The magnetic force exerted on it is

Correct Answer
verified

A straight wire carries a current of 10 A at an angle of 30° with respect to the direction of a uniform 0.30-T $\vec { B }$ field.Find the magnitude of the magnetic force exerted on a 0.50-m length of the wire.

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 proton is to orbit Earth at the equator using Earth's magnetic field to exert part of the necessary radial component of the sum of the forces.In what direction should the proton move?

Correct Answer
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At a point 10 m away from a long straight thin wire,the $\vec { B }$ field due to the wire is 0.10 mT.What is the current through the wire? (μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
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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 magnitude of the $\vec { B }$ field midway between the two wires? (μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
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A vertical wire carries a current vertically downward.To the east of this wire,the $\vec { B }$ field points

Correct Answer
verified

An electron has an initial velocity to the south but is observed to curve upward as the result of a magnetic field.This $\vec { B }$ field must have a component

Correct Answer
verified

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

Correct Answer
verified

Exam 18: Magnetism

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A proton,moving north,enters a magnetic field.Because of this field,the proton curves downward.We may conclude that the B⃗\vec { B }B field must have a component

Correct AnswerverifiedShow Answer

At a particular instant,a proton moves toward the east in a uniform B⃗\vec { B }B field that is directed straight downward.The magnetic force exerted on it is

Correct AnswerverifiedShow Answer

A straight wire carries a current of 10 A at an angle of 30° with respect to the direction of a uniform 0.30-T B⃗\vec { B }B field.Find the magnitude of the magnetic force exerted on a 0.50-m length of the wire.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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 through this coil in the direction shown,what is the direction of the force exerted on section BC of this coil?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A proton is to orbit Earth at the equator using Earth's magnetic field to exert part of the necessary radial component of the sum of the forces.In what direction should the proton move?

Correct AnswerverifiedShow Answer

At a point 10 m away from a long straight thin wire,the B⃗\vec { B }B field due to the wire is 0.10 mT.What is the current through the wire? (μ0 = 4π × 10-7 T ∙ m/A)

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 magnitude of the B⃗\vec { B }B field midway between the two wires? (μ0 = 4π × 10-7 T ∙ m/A)

Correct AnswerverifiedShow Answer

A vertical wire carries a current vertically downward.To the east of this wire,the B⃗\vec { B }B field points

Correct AnswerverifiedShow Answer

An electron has an initial velocity to the south but is observed to curve upward as the result of a magnetic field.This B⃗\vec { B }B field must have a component

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A proton,moving north,enters a magnetic field.Because of this field,the proton curves downward.We may conclude that the $\vec { B }$ field must have a component

Correct Answer
verified

At a particular instant,a proton moves toward the east in a uniform $\vec { B }$ field that is directed straight downward.The magnetic force exerted on it is

Correct Answer
verified

A straight wire carries a current of 10 A at an angle of 30° with respect to the direction of a uniform 0.30-T $\vec { B }$ field.Find the magnitude of the magnetic force exerted on a 0.50-m length of the wire.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

At a point 10 m away from a long straight thin wire,the $\vec { B }$ field due to the wire is 0.10 mT.What is the current through the wire? (μ₀ = 4π × 10^-7 T ∙ m/A)

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 magnitude of the $\vec { B }$ field midway between the two wires? (μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
verified

A vertical wire carries a current vertically downward.To the east of this wire,the $\vec { B }$ field points

Correct Answer
verified

An electron has an initial velocity to the south but is observed to curve upward as the result of a magnetic field.This $\vec { B }$ field must have a component

Correct Answer
verified

Correct Answer
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