Exam 18: Magnetism

A proton having a speed of 3.0 × 10⁶ m/s in a direction perpendicular to a uniform magnetic field moves in a circle of radius 0.20 m within the field.What is the magnitude of the $\vec { B }$ field? (e = 1.60 × 10^-19 C,m_proton = 1.67 × 10^-27 kg)

(Multiple Choice)

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Question 21

What must be the current through a long straight wire for the $\vec { B }$ field to be 1.0 mT at 1.0 cm from a wire? (μ₀ = 4π × 10^-7 T ∙ m/A)

(Multiple Choice)

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Question 22

In a mass spectrometer,a single-charged particle has a speed of 1.00 × 10⁶ m/s and enters a uniform magnetic $\vec { B }$ of 0.200 T at a right angle to the $\vec { B }$ field vector.The radius of the resulting circular orbit is 20.75 cm.What is the mass of the particle? (e = 1.60 × 10^-19C)

(Multiple Choice)

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Question 23

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 $\vec { B }$ field lines.

(Multiple Choice)

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Question 24

A particle carrying a charge of +e travels in a circular path of radius R in a uniform magnetic field.If instead the particle carried a charge of +2e,the radius of the circular path would have been

(Multiple Choice)

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Question 25

A very long straight current-carrying wire produces a $\vec { B }$ 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

(Multiple Choice)

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Question 26

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 exerted on the proton?

(Multiple Choice)

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Question 27

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 CD of this coil?

(Multiple Choice)

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Question 28

We observe that there is no magnetic force exerted on a moving charged particle.From this we can definitely conclude that

(Multiple Choice)

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Question 29

The maximum torque exerted on a flat current-carrying loop occurs when the angle between the plane of the loop's area and the $\vec { B }$ field vector is

(Multiple Choice)

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Question 30

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

(Multiple Choice)

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Question 31

A current-carrying loop of wire lies flat on a horizontal tabletop.When viewed from above,the direction of the current around the loop is in a counterclockwise sense.For points on the tabletop outside the loop,the $\vec { B }$ field lines caused by this current

(Multiple Choice)

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Question 32

For the horseshoe magnet shown in the figure,the left end is a north magnetic pole and the right end is a south magnetic pole.When the switch is closed in the circuit,which way will the wire between the poles of the horseshoe magnet initially deflect?

(Multiple Choice)

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Question 33

A current-carrying loop of wire lies flat on a horizontal tabletop.When viewed from above,the current through the loop is in a counterclockwise sense.For points on the tabletop inside the loop,the $\vec { B }$ field lines caused by this current

(Multiple Choice)

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Question 34

Which of the following are units for the magnetic moment? (There could be more than one correct choice.)

(Multiple Choice)

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Question 35

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 0.85-T $\vec { B }$ 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 $\vec { B }$ field direction is measured.What are the magnitude and direction of the magnetic force exerted on section DE of this wire? $A wire in the shape of an M lies in the plane of the paper.It carries a current of 2.0 A,flowing from A to E,as shown in the figure.It is placed in a uniform 0.85-T \vec { B } field in the same plane,directed as shown on the right side of the figure.The figure indicates the dimensions of the wire.Note that AB is parallel to DE and to the baseline from which the \vec { B } field direction is measured.What are the magnitude and direction of the magnetic force exerted on section DE of this wire?$

(Multiple Choice)

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Question 36

The magnetic force exerted on a current-carrying wire in a magnetic field is the strongest when

(Multiple Choice)

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Question 37

A flat circular coil having 57 turns of very thin wire has a diameter of 9.5 cm and carries 7.2 A of current.(μ₀ = 4π × 10^-7 T ∙ m/A) (a)What is the magnitude of the $\vec { B }$ field at the center of the coil? (b)If the same length of wire were used to make a coil with twice the original diameter,how large would the $\vec { B }$ field at the center be when it carried the same current as before?

(Short Answer)

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Question 38

A flat circular coil has 250 identical loops of very thin wire.Each loop has an area of 0.12 m² and carries 15 mA of current.This coil is placed in a magnetic field of 0.050 T oriented at 30° to the plane of the loop.What is the magnitude of the magnetic moment of the coil?

(Short Answer)

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Question 39

A wire carrying a current is shaped in the form of a circular loop of radius 4.0 mm.If the $\vec { B }$ field magnitude at its center is $1.1 \mathrm { mT }$ with no external magnetic fields present,what is the magnitude of the current through the wire? (μ₀ = 4π × 10^-7 T ∙ m/A)

(Multiple Choice)

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Question 40

Showing 21 - 40 of 136

Exam 18: Magnetism

A proton having a speed of 3.0 × 106 m/s in a direction perpendicular to a uniform magnetic field moves in a circle of radius 0.20 m within the field.What is the magnitude of the B⃗\vec { B }B field? (e = 1.60 × 10-19 C,mproton = 1.67 × 10-27 kg)

What must be the current through a long straight wire for the B⃗\vec { B }B field to be 1.0 mT at 1.0 cm from a wire? (μ0 = 4π × 10-7 T ∙ m/A)

In a mass spectrometer,a single-charged particle has a speed of 1.00 × 106 m/s and enters a uniform magnetic B⃗\vec { B }B of 0.200 T at a right angle to the B⃗\vec { B }B field vector.The radius of the resulting circular orbit is 20.75 cm.What is the mass of the particle? (e = 1.60 × 10-19C)

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 B⃗\vec { B }B field lines.

A particle carrying a charge of +e travels in a circular path of radius R in a uniform magnetic field.If instead the particle carried a charge of +2e,the radius of the circular path would have been

A very long straight current-carrying wire produces a B⃗\vec { B }B 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

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 exerted on the proton?

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 CD of this coil?

We observe that there is no magnetic force exerted on a moving charged particle.From this we can definitely conclude that

The maximum torque exerted on a flat current-carrying loop occurs when the angle between the plane of the loop's area and the B⃗\vec { B }B field vector is

A current-carrying loop of wire lies flat on a horizontal tabletop.When viewed from above,the direction of the current around the loop is in a counterclockwise sense.For points on the tabletop outside the loop,the B⃗\vec { B }B field lines caused by this current

For the horseshoe magnet shown in the figure,the left end is a north magnetic pole and the right end is a south magnetic pole.When the switch is closed in the circuit,which way will the wire between the poles of the horseshoe magnet initially deflect?

A current-carrying loop of wire lies flat on a horizontal tabletop.When viewed from above,the current through the loop is in a counterclockwise sense.For points on the tabletop inside the loop,the B⃗\vec { B }B field lines caused by this current

Which of the following are units for the magnetic moment? (There could be more than one correct choice.)

The magnetic force exerted on a current-carrying wire in a magnetic field is the strongest when

A flat circular coil has 250 identical loops of very thin wire.Each loop has an area of 0.12 m2 and carries 15 mA of current.This coil is placed in a magnetic field of 0.050 T oriented at 30° to the plane of the loop.What is the magnitude of the magnetic moment of the coil?

A wire carrying a current is shaped in the form of a circular loop of radius 4.0 mm.If the B⃗\vec { B }B field magnitude at its center is 1.1mT1.1 \mathrm { mT }1.1mT with no external magnetic fields present,what is the magnitude of the current through the wire? (μ0 = 4π × 10-7 T ∙ m/A)

Introduction

Kinematics: Motion in One Dimension

Newtonian Mechanics

Applying Newtons Laws

Circular Motion

Impulse and Linear Momentum

Work and Energy

Extended Bodies at Rest

Rotational Motion

Gases

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First Law of Thermodynamics

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Electric Charge force and Energy

The Electric Field

Dc Circuits

Electromagnetic Induction

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A proton having a speed of 3.0 × 10⁶ m/s in a direction perpendicular to a uniform magnetic field moves in a circle of radius 0.20 m within the field.What is the magnitude of the $\vec { B }$ field? (e = 1.60 × 10^-19 C,m_proton = 1.67 × 10^-27 kg)

What must be the current through a long straight wire for the $\vec { B }$ field to be 1.0 mT at 1.0 cm from a wire? (μ₀ = 4π × 10^-7 T ∙ m/A)

In a mass spectrometer,a single-charged particle has a speed of 1.00 × 10⁶ m/s and enters a uniform magnetic $\vec { B }$ of 0.200 T at a right angle to the $\vec { B }$ field vector.The radius of the resulting circular orbit is 20.75 cm.What is the mass of the particle? (e = 1.60 × 10^-19C)

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 $\vec { B }$ field lines.

A very long straight current-carrying wire produces a $\vec { B }$ 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

The maximum torque exerted on a flat current-carrying loop occurs when the angle between the plane of the loop's area and the $\vec { B }$ field vector is

A current-carrying loop of wire lies flat on a horizontal tabletop.When viewed from above,the direction of the current around the loop is in a counterclockwise sense.For points on the tabletop outside the loop,the $\vec { B }$ field lines caused by this current

A current-carrying loop of wire lies flat on a horizontal tabletop.When viewed from above,the current through the loop is in a counterclockwise sense.For points on the tabletop inside the loop,the $\vec { B }$ field lines caused by this current

A flat circular coil has 250 identical loops of very thin wire.Each loop has an area of 0.12 m² and carries 15 mA of current.This coil is placed in a magnetic field of 0.050 T oriented at 30° to the plane of the loop.What is the magnitude of the magnetic moment of the coil?

A wire carrying a current is shaped in the form of a circular loop of radius 4.0 mm.If the $\vec { B }$ field magnitude at its center is $1.1 \mathrm { mT }$ with no external magnetic fields present,what is the magnitude of the current through the wire? (μ₀ = 4π × 10^-7 T ∙ m/A)