Question 1

An electron,moving south,enters a magnetic field.Because of this field,the electron curves upward.We may conclude that the $\vec { B }$ field must have a component

Accepted Answer

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

Question 2

A proton moving at 5.0 × 104 m/s horizontally enters a region where a $\vec { B }$ field of 0.12 T is present,directed vertically downward.What magnitude force acts on the proton due to this field?
(e = 1.60 × 10-19C)

Accepted Answer

Question 3

A rigid rectangular loop,measuring 0.30 m by 0.40 m,carries a current of 9.9 A,as shown in the figure.A uniform external magnetic field of magnitude 1.8 T in the -x direction is present.Segment CD is in the xz-plane and forms a 19° angle with the z-axis,as shown.What is the y component of the magnetic force exerted on segment AB of the loop?

Accepted Answer

A) +5.1 N 
B) -5.1 N 
C) +1.7 N 
D) -1.7 N 
E) 0.0 N 
A) +5.1 N 
B) -5.1 N 
C) +1.7 N 
D) -1.7 N 
E) 0.0 N

Question 4

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

Accepted Answer

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

Question 5

A flat circular loop of wire is in a uniform $\vec { B }$ field of 0.30 T.The diameter of the loop is 1.0 m,and a 2.0-A current flows in it.What is the magnitude of the magnetic torque on the loop when the plane of the loop is parallel to the $\vec { B }$ field?

Accepted Answer

A) 0.00 N ∙ m 
B) 0.41 N ∙ m 
C) 0.47 N ∙ m 
D) 0.52 N ∙ m 
A) 0.00 N ∙ m 
B) 0.41 N ∙ m 
C) 0.47 N ∙ m 
D) 0.52 N ∙ m

Question 6

A doubly charged ion with speed 6.9 × 106 m/s enters a uniform 0.80-T magnetic field,traveling perpendicular to the $\vec { B }$ field.Once in the field,it moves in a circular arc of radius 30 cm.What is the mass of this ion? (e = 1.60 × 10-19 C)

Accepted Answer

A) 11 × 10-27 kg 
B) 6.7 × 10-27 kg 
C) 3.3 × 10-27 kg 
D) 8.2 × 10-27 kg 
A) 11 × 10-27 kg 
B) 6.7 × 10-27 kg 
C) 3.3 × 10-27 kg 
D) 8.2 × 10-27 kg

Question 7

A flat circular loop of wire of radius 0.50 m that is carrying a 2.0-A current is in a uniform magnetic field of 0.30 T.What is the magnitude of the magnetic torque exerted on the loop when the plane of its area is perpendicular to the $\vec { B }$ field?

Accepted Answer

A) 0.00 N ∙ m 
B) 0.41 N ∙ m 
C) 0.47 N ∙ m 
D) 0.52 N ∙ m 
E) 0.58 N ∙ m 
A) 0.00 N ∙ m 
B) 0.41 N ∙ m 
C) 0.47 N ∙ m 
D) 0.52 N ∙ m 
E) 0.58 N ∙ m

Question 8

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 ∙ m2 
A) 0.23 A ∙ m2 
B) 2.3 A ∙ m2 
C) 23 A ∙ m2 
D) 230 A ∙ m2

Question 9

A geophysicist measures the magnetic force exerted on a proton that is moving vertically downward at a point 1.996 km/s at Earth's equator.At that location,Earth's $\vec { B }$ field is horizontal and has a magnitude of 0.40 × 10-4 T.What are the magnitude and direction of the force she will measure? (e = 1.60 × 10-19C)

Accepted Answer

1.3 × 10^-20 N

Question 10

A negatively charged particle -Q is moving to the right,directly above a wire having a current I through it to the right,as shown in the figure.In what direction is the magnetic force exerted on the particle by the current-carrying wire?

Accepted Answer

A) into the page 
B) out of the page 
C) downward 
D) upward 
E) The magnetic force is zero because the velocity is parallel to the current. 
A) into the page 
B) out of the page 
C) downward 
D) upward 
E) The magnetic force is zero because the velocity is parallel to the current.

Question 11

A straight bar magnet is initially 4 cm long,with the north pole on the right and the south pole on the left.If you cut the magnet in half,the right half will

Accepted Answer

A) contain only a north pole. 
B) contain a north pole on the right and a south pole on the left. 
C) contain only a south pole. 
D) no longer contain any poles. 
A) contain only a north pole. 
B) contain a north pole on the right and a south pole on the left. 
C) contain only a south pole. 
D) no longer contain any poles.

Question 12

If you were to cut a small permanent bar magnet in half,

Accepted Answer

A) one piece would be a magnetic north pole and the other piece would be a south pole. 
B) neither piece would be magnetic. 
C) each piece would in itself be a smaller bar magnet with both north and south poles. 
D) None of these statements is true. 
A) one piece would be a magnetic north pole and the other piece would be a south pole. 
B) neither piece would be magnetic. 
C) each piece would in itself be a smaller bar magnet with both north and south poles. 
D) None of these statements is true.

Question 13

In the figure,the rectangular loop is pivoted about one side (of length 0.060 m),that coincides with the y-axis.The end (length 0.020 m)of the loop that lies in the xz-plane makes an angle of 37° with the x-axis as shown.The loop carries a current of I = 69 A in the direction shown.(In the side of the loop that is along the y-axis the current is in the +y direction.)If there is a uniform $\vec { B }$ field of magnitude 9.7 T in the -x direction,find the magnitude of the torque that this magnetic field exerts on the loop.

Accepted Answer

The answer of In the figure,the rectangular loop is pivoted...

Question 14

A proton,starting from rest,accelerates through a potential difference of 1.0 kV and then moves into a magnetic field of 0.040 T at a right angle to the $\vec { B }$ field.What is the radius of the proton's resulting orbit? (e = 1.60 × 10-19 C,mproton = 1.67 × 10-27 kg)

Accepted Answer

A) 0.080 m 
B) 0.11 m 
C) 0.14 m 
D) 0.17 m 
A) 0.080 m 
B) 0.11 m 
C) 0.14 m 
D) 0.17 m

Question 15

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 makes a 30° angle with the $\vec { B }$ field vector.At that instant,what is the magnitude of the torque exerted on the wire by 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 ∙ m 
A) 0.30 N ∙ m 
B) 0.40 N ∙ m 
C) 0.48 N ∙ m 
D) 0.83 N ∙ m 
E) 0.96 N ∙ m

Question 16

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 0.55-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 CD of this wire?

Accepted Answer

A) 0.066 N perpendicular into the page 
B) 0.40 N perpendicular out of the page 
C) 0.066 N perpendicular out of the page 
D) 0.40 N perpendicular into the page 
E) 0.20 N perpendicular out of the page 
A) 0.066 N perpendicular into the page 
B) 0.40 N perpendicular out of the page 
C) 0.066 N perpendicular out of the page 
D) 0.40 N perpendicular into the page 
E) 0.20 N perpendicular out of the page

Question 17

Three particles travel through a region of space where the $\vec { B }$ 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. 
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.

Question 18

What is the strength of the $\vec { B }$ field at the center of a circular loop of wire of diameter 8.0 cm with a current of 2.0 A through the wire? (μ0 = 4π × 10-7 T ∙ m/A)

Accepted Answer

Question 19

A straight wire is carrying a current of 2.0 A.It is placed at an angle of 60° with respect to a 0.20-T $\vec { B }$ field.If magnetic force exerted on the wire has a magnitude 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 m 
A) 1.0 m 
B) 1.2 m 
C) 1.4 m 
D) 1.6 m 
E) 1.8 m

Question 20

A single current-carrying circular loop of radius R is placed next to a long,straight wire,as shown in the figure.The current I in the wire flows to the right.In which direction must current flow in the loop to produce a net magnetic field of zero at its center?

Accepted Answer

A) counterclockwise 
B) clockwise 
C) It could be either clockwise or counterclockwise. 
D) The current in the loop should be zero. 
A) counterclockwise 
B) clockwise 
C) It could be either clockwise or counterclockwise. 
D) The current in the loop should be zero.

Exam 18: Magnetism

An electron,moving south,enters a magnetic field.Because of this field,the electron curves upward.We may conclude that the B⃗\vec { B }B field must have a component

A proton moving at 5.0 × 104 m/s horizontally enters a region where a B⃗\vec { B }B field of 0.12 T is present,directed vertically downward.What magnitude force acts on the proton due to this field? (e = 1.60 × 10-19C)

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

A flat circular loop of wire is in a uniform B⃗\vec { B }B field of 0.30 T.The diameter of the loop is 1.0 m,and a 2.0-A current flows in it.What is the magnitude of the magnetic torque on the loop when the plane of the loop is parallel to the B⃗\vec { B }B field?

A doubly charged ion with speed 6.9 × 106 m/s enters a uniform 0.80-T magnetic field,traveling perpendicular to the B⃗\vec { B }B field.Once in the field,it moves in a circular arc of radius 30 cm.What is the mass of this ion? (e = 1.60 × 10-19 C)

A flat circular loop of wire of radius 0.50 m that is carrying a 2.0-A current is in a uniform magnetic field of 0.30 T.What is the magnitude of the magnetic torque exerted on the loop when the plane of its area is perpendicular to the B⃗\vec { B }B field?

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?

A negatively charged particle -Q is moving to the right,directly above a wire having a current I through it to the right,as shown in the figure.In what direction is the magnetic force exerted on the particle by the current-carrying wire?

A straight bar magnet is initially 4 cm long,with the north pole on the right and the south pole on the left.If you cut the magnet in half,the right half will

If you were to cut a small permanent bar magnet in half,

A proton,starting from rest,accelerates through a potential difference of 1.0 kV and then moves into a magnetic field of 0.040 T at a right angle to the B⃗\vec { B }B field.What is the radius of the proton's resulting orbit? (e = 1.60 × 10-19 C,mproton = 1.67 × 10-27 kg)

Three particles travel through a region of space where the B⃗\vec { B }B field is out of the page,as shown in the figure.What are the signs of the charges of these three particles?

What is the strength of the B⃗\vec { B }B field at the center of a circular loop of wire of diameter 8.0 cm with a current of 2.0 A through the wire? (μ0 = 4π × 10-7 T ∙ m/A)

A straight wire is carrying a current of 2.0 A.It is placed at an angle of 60° with respect to a 0.20-T B⃗\vec { B }B field.If magnetic force exerted on the wire has a magnitude of 0.40 N,what is the length of the wire?

A single current-carrying circular loop of radius R is placed next to a long,straight wire,as shown in the figure.The current I in the wire flows to the right.In which direction must current flow in the loop to produce a net magnetic field of zero at its center?

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

Static Fluids

Fluids in Motion

First Law of Thermodynamics

Second Law of Thermodynamics

Electric Charge force and Energy

The Electric Field

Dc Circuits

Electromagnetic Induction

Vibrational Motion

Mechanical Waves

Reflection and Refraction

Mirrors and Lenses

Wave Optics

Electromagnetic Waves

Special Relativity

Quantum Optics

Atomic Physics

Nuclear Physics

Particle Physics

Filters

An electron,moving south,enters a magnetic field.Because of this field,the electron curves upward.We may conclude that the $\vec { B }$ field must have a component

A proton moving at 5.0 × 10⁴ m/s horizontally enters a region where a $\vec { B }$ field of 0.12 T is present,directed vertically downward.What magnitude force acts on the proton due to this field? (e = 1.60 × 10^-19C)

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

A flat circular loop of wire is in a uniform $\vec { B }$ field of 0.30 T.The diameter of the loop is 1.0 m,and a 2.0-A current flows in it.What is the magnitude of the magnetic torque on the loop when the plane of the loop is parallel to the $\vec { B }$ field?

A doubly charged ion with speed 6.9 × 10⁶ m/s enters a uniform 0.80-T magnetic field,traveling perpendicular to the $\vec { B }$ field.Once in the field,it moves in a circular arc of radius 30 cm.What is the mass of this ion? (e = 1.60 × 10^-19 C)

A flat circular loop of wire of radius 0.50 m that is carrying a 2.0-A current is in a uniform magnetic field of 0.30 T.What is the magnitude of the magnetic torque exerted on the loop when the plane of its area is perpendicular to the $\vec { B }$ field?

A proton,starting from rest,accelerates through a potential difference of 1.0 kV and then moves into a magnetic field of 0.040 T at a right angle to the $\vec { B }$ field.What is the radius of the proton's resulting orbit? (e = 1.60 × 10^-19 C,m_proton = 1.67 × 10^-27 kg)

What is the strength of the $\vec { B }$ field at the center of a circular loop of wire of diameter 8.0 cm with a current of 2.0 A through the wire? (μ₀ = 4π × 10^-7 T ∙ m/A)

A straight wire is carrying a current of 2.0 A.It is placed at an angle of 60° with respect to a 0.20-T $\vec { B }$ field.If magnetic force exerted on the wire has a magnitude of 0.40 N,what is the length of the wire?