Question 1

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 perpendicular 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) None of the above
G) A) and D)

Question 2

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 magnetic field of 0.85 T 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 magnetic field direction is measured.What are the magnitude and direction of the net force acting 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 pageF) C) and D)
G) D) and E)

Question 3

An electron moves with a speed of 8.0 × 106 m/s along the +x-axis.It enters a region where there is a magnetic field of 2.5 T,directed at an angle of 60° to the +x-axis and lying in the xy-plane.Calculate the magnitude of the magnetic force on the electron.(e = 1.60 × 10-19C)

Accepted Answer

A)  2.8 × 10-10 N
B)  3.2 × 10-10 N
C)  2.8 × 10-12 N
D)  3.2 × 10-12 NE) B) and C)
F) All of the above

Question 4

A proton,moving north,enters a magnetic field.Because of this field,the proton curves downward.We may conclude that the magnetic field must have a component

Accepted Answer

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

Question 5

A charged particle that is moving in a static uniform magnetic field

Accepted Answer

A)  will always experience a magnetic force,regardless of its direction of motion.
B)  may experience a magnetic force which will cause its speed to change.
C)  may experience a magnetic force,but its speed will not change.
D)  may experience a magnetic force,but its direction of motion will not change.
E)  None of the above statements are true.F) B) and D)
G) C) and D)

Question 6

What is the magnetic moment of a rectangular loop having 120 turns that carries 6.0 A if its dimensions are 4.0 cm × 8.0 cm?

Accepted Answer

A)  0.23 A ∙ m2
B)  2.3 A ∙ m2
C)  23 A ∙ m2
D)  230 A ∙ m2E) C) and D)
F) None of the above

Question 7

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) C) and D)
G) A) and B)

Question 8

An object is hung using a metal spring.If now a current is passed through the spring,what will happen to this system?

Accepted Answer

A)  The spring will contract,raising the weight.
B)  The spring will extend,lowering the weight.
C)  The weight will not move.
D)  The spring will begin to swing like a pendulum.
E)  None of these are true.F) B) and E)
G) A) and B)

Question 9

A wire carrying a current is shaped in the form of a circular loop of radius 4.0 mm.If the magnetic field strength at its center is 0 = 4π × 10-7 T ∙ m/A)  A) 7.0 A B) 28 A C) 14 A D) 17 A" class="answers-bank-image d-inline" rel="preload" >
With no external magnetic fields present,what is the magnitude of the current flowing through the wire? (μ0 = 4π × 10-7 T ∙ m/A)

Accepted Answer

A)  7.0 A
B)  28 A
C)  14 A
D)  17 AE) None of the above
F) All of the above

Question 10

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  .F) B) and E)
G) C) and D)

Question 11

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 makes a 30° angle with the field.At that instant,what is the magnitude of the torque acting on the wire due to the magnetic field?

Accepted Answer

A)  0.30 N ∙ m
B)  0.40 N ∙ m
C)  0.48 N ∙ m
D)  0.83 N ∙ m
E)  0.96 N ∙ mF) C) and D)
G) A) and E)

Question 12

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,as shown in the figure.It is placed in a uniform magnetic field of 0.65 T 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 magnetic field direction is measured.What are the magnitude and direction of the force acting on section BC of this wire?

Accepted Answer

A)  0 N
B)  0.090 N perpendicular out of the page
C)  0.090 N perpendicular into the page
D)  0.060 N perpendicular out of the page
E)  none of the aboveF) All of the above
G) A) and E)

Question 13

Three particles travel through a region of space where the magnetic field is out of the page,as shown in the figure.What are the signs of the charges of these three particles?

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 C)

Question 14

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) B) and E)
G) A) and D) C

Question 15

A long straight wire has a constant current flowing to the right.A rectangular metal loop is situated above the wire,and also has a constant current flowing through it,as shown in the figure.Which one of the following statements is true?

Accepted Answer

A)  The net magnetic force on the rectangle is upward,and there is also a nonzero torque on the rectangle.
B)  The net magnetic force on the rectangle is zero,and the net torque on it is zero.
C)  The net magnetic force on the rectangle is downward,and there is also a nonzero torque on the rectangle.
D)  The net magnetic force on the rectangle is zero,but there is a nonzero torque on the rectangle.
E)  The net magnetic force on the rectangle is downward,and the net torque on it is zero.F) A) and B)
G) A) and C)

Question 16

A charged particle is injected into a uniform magnetic field such that its velocity vector is perpendicular to the magnetic field lines.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)  follow a circular path.E) C) and D)
F) B) and C) D

Question 17

A straight wire is carrying a current of 2.0 A.It is placed at an angle of 60° with respect to a magnetic field of strength 0.20 T.If the wire experiences a force of 0.40 N,what is the length of the wire?

Accepted Answer

A)  1.0 m
B)  1.2 m
C)  1.4 m
D)  1.6 m
E)  1.8 mF) A) and B)
G) C) and E)

Question 18

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

Accepted Answer

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

Question 19

A long,straight wire carrying a current is placed along the y-axis.If the direction of the current is in the +y direction,what is the direction of the magnetic field due to this wire as you view it in such a way that the current is coming directly toward you?

Accepted Answer

A)  clockwise,around the x-axis
B)  counterclockwise,around the x-axis
C)  counterclockwise,around the z-axis
D)  counterclockwise,around the y-axis
E)  clockwise,around the y-axisF) All of the above
G) A) and B)

Question 20

Two long parallel wires that are 0.30 m apart carry currents of 5.0 A and 8.0 A in the opposite direction.Find the magnitude of the force per unit length that each wire exerts on the other wire and indicate if the force is attractive or repulsive.(μ0 = 4π × 10-7 T ∙ m/A)

Accepted Answer

A)  2.7 × 10-5 N repulsive
B)  7.2 × 10-5 N repulsive
C)  3.4 × 10-5 N attractive
D)  2.7 × 10-5 N attractive
E)  7.2 × 10-5 N attractiveF) C) and D)
G) A) and E)

Exam 22: Magnetism

Correct Answer
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Correct Answer
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An electron moves with a speed of 8.0 × 10⁶ m/s along the +x-axis.It enters a region where there is a magnetic field of 2.5 T,directed at an angle of 60° to the +x-axis and lying in the xy-plane.Calculate the magnitude of the magnetic force on the electron.(e = 1.60 × 10^-19C)

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 magnetic field must have a component

Correct Answer
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A charged particle that is moving in a static uniform magnetic field

Correct Answer
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What is the magnetic moment of a rectangular loop having 120 turns that carries 6.0 A if its dimensions are 4.0 cm × 8.0 cm?

Correct Answer
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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
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An object is hung using a metal spring.If now a current is passed through the spring,what will happen to this system?

Correct Answer
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A wire carrying a current is shaped in the form of a circular loop of radius 4.0 mm.If the magnetic field strength at its center is With no external magnetic fields present,what is the magnitude of the current flowing through the wire? (μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
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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
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Correct Answer
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Correct Answer
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Three particles travel through a region of space where the magnetic field is out of the page,as shown in the figure.What are the signs of the charges of these three particles?

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

Correct Answer
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C

A long straight wire has a constant current flowing to the right.A rectangular metal loop is situated above the wire,and also has a constant current flowing through it,as shown in the figure.Which one of the following statements is true?

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

Correct Answer
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D

A straight wire is carrying a current of 2.0 A.It is placed at an angle of 60° with respect to a magnetic field of strength 0.20 T.If the wire experiences a force of 0.40 N,what is the length of the wire?

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

Correct Answer
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A

A long,straight wire carrying a current is placed along the y-axis.If the direction of the current is in the +y direction,what is the direction of the magnetic field due to this wire as you view it in such a way that the current is coming directly toward you?

Correct Answer
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Two long parallel wires that are 0.30 m apart carry currents of 5.0 A and 8.0 A in the opposite direction.Find the magnitude of the force per unit length that each wire exerts on the other wire and indicate if the force is attractive or repulsive.(μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
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Exam 22: Magnetism

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

An electron moves with a speed of 8.0 × 106 m/s along the +x-axis.It enters a region where there is a magnetic field of 2.5 T,directed at an angle of 60° to the +x-axis and lying in the xy-plane.Calculate the magnitude of the magnetic force on the electron.(e = 1.60 × 10-19C)

Correct AnswerverifiedShow Answer

A proton,moving north,enters a magnetic field.Because of this field,the proton curves downward.We may conclude that the magnetic field must have a component

Correct AnswerverifiedShow Answer

A charged particle that is moving in a static uniform magnetic field

Correct AnswerverifiedShow Answer

What is the magnetic moment of a rectangular loop having 120 turns that carries 6.0 A if its dimensions are 4.0 cm × 8.0 cm?

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 object is hung using a metal spring.If now a current is passed through the spring,what will happen to this system?

Correct AnswerverifiedShow Answer

A wire carrying a current is shaped in the form of a circular loop of radius 4.0 mm.If the magnetic field strength at its center is With no external magnetic fields present,what is the magnitude of the current flowing through the wire? (μ0 = 4π × 10-7 T ∙ m/A)

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Three particles travel through a region of space where the magnetic field is out of the page,as shown in the figure.What are the signs of the charges of these three particles?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedC

A long straight wire has a constant current flowing to the right.A rectangular metal loop is situated above the wire,and also has a constant current flowing through it,as shown in the figure.Which one of the following statements is true?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedD

A straight wire is carrying a current of 2.0 A.It is placed at an angle of 60° with respect to a magnetic field of strength 0.20 T.If the wire experiences a force of 0.40 N,what is the length of the wire?

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

Correct AnswerverifiedA

A long,straight wire carrying a current is placed along the y-axis.If the direction of the current is in the +y direction,what is the direction of the magnetic field due to this wire as you view it in such a way that the current is coming directly toward you?

Correct AnswerverifiedShow Answer

Two long parallel wires that are 0.30 m apart carry currents of 5.0 A and 8.0 A in the opposite direction.Find the magnitude of the force per unit length that each wire exerts on the other wire and indicate if the force is attractive or repulsive.(μ0 = 4π × 10-7 T ∙ m/A)

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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An electron moves with a speed of 8.0 × 10⁶ m/s along the +x-axis.It enters a region where there is a magnetic field of 2.5 T,directed at an angle of 60° to the +x-axis and lying in the xy-plane.Calculate the magnitude of the magnetic force on the electron.(e = 1.60 × 10^-19C)

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 wire carrying a current is shaped in the form of a circular loop of radius 4.0 mm.If the magnetic field strength at its center is With no external magnetic fields present,what is the magnitude of the current flowing through the wire? (μ₀ = 4π × 10^-7 T ∙ m/A)

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Correct Answer
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C

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D

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A

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Two long parallel wires that are 0.30 m apart carry currents of 5.0 A and 8.0 A in the opposite direction.Find the magnitude of the force per unit length that each wire exerts on the other wire and indicate if the force is attractive or repulsive.(μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
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