Question 1

A proton starting from rest travels through a potential of 1.0 kV and then moves into a uniform 0.040-T magnetic field.What is the radius of the proton's resulting orbit?  ,

Accepted Answer

A)   0.080 m
B)   0.11 m
C)   0.14 m
D)   0.17 m
E)   0.19 mF) A) and D)
G) A) and B) B

Question 2

An L-shaped metal machine part is made of two equal-length segments that are perpendicular to each other and carry a 4.50-A current as shown in the figure.This part has a total mass of 3.80 kg and a total length of 3.00 m,and it is in an external 1.20-T magnetic field that is oriented perpendicular to the plane of the part,as shown.What is the magnitude of the NET magnetic force that the field exerts on the part?

Accepted Answer

A)   8.10 N
B)   11.5 N
C)   16.2 N
D)   22.9 N
E)   32.4 NF) A) and C)
G) C) and E)

Question 3

Ions having equal charges but masses of M and 2M are accelerated through the same potential difference and then enter a uniform magnetic field perpendicular to their path.If the heavier ions follow a circular arc of radius R,what is the radius of the arc followed by the lighter?

Accepted Answer

A)   4R
B)   3R
C)    R
D)   R/ 
E)   R/2F) A) and E)
G) C) and E)

Question 4

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 points A to E,as shown in the figure.It is placed in a uniform magnetic field of 0.75 T in the same plane,directed as shown on the right side of the figure.The figure indicates the dimensions of the wire.What are the magnitude and direction of the force acting on  (a)section AB of this wire?
(b)section BC of this wire?
(c)section CD of this wire?
(d)section DE of this wire?
(e)the entire wire?

Accepted Answer

(a)0.11 N perpendicular out of...

Question 5

An electron moving with a velocity 7 m/s   enters a region of space where perpendicular electric and a magnetic fields are present.The electric field is   =   .What magnetic field will allow the electron to go through the region without being deflected? A)    = +2.0 × 10-4 T   B)    = -2.0 × 10-4 T   C)    = +2.0 × 10-4 T   D)    = -2.0 × 10-4 T   E)    = +5.0 × 10-4 T  " class="answers-bank-image d-inline" rel="preload" > = 5.0 × 107 m/s 7 m/s   enters a region of space where perpendicular electric and a magnetic fields are present.The electric field is   =   .What magnetic field will allow the electron to go through the region without being deflected? A)    = +2.0 × 10-4 T   B)    = -2.0 × 10-4 T   C)    = +2.0 × 10-4 T   D)    = -2.0 × 10-4 T   E)    = +5.0 × 10-4 T  " class="answers-bank-image d-inline" rel="preload" > enters a region of space where perpendicular electric and a magnetic fields are present.The electric field is 7 m/s   enters a region of space where perpendicular electric and a magnetic fields are present.The electric field is   =   .What magnetic field will allow the electron to go through the region without being deflected? A)    = +2.0 × 10-4 T   B)    = -2.0 × 10-4 T   C)    = +2.0 × 10-4 T   D)    = -2.0 × 10-4 T   E)    = +5.0 × 10-4 T  " class="answers-bank-image d-inline" rel="preload" > = 7 m/s   enters a region of space where perpendicular electric and a magnetic fields are present.The electric field is   =   .What magnetic field will allow the electron to go through the region without being deflected? A)    = +2.0 × 10-4 T   B)    = -2.0 × 10-4 T   C)    = +2.0 × 10-4 T   D)    = -2.0 × 10-4 T   E)    = +5.0 × 10-4 T  " class="answers-bank-image d-inline" rel="preload" > .What magnetic field will allow the electron to go through the region without being deflected?

Accepted Answer

A)   7 m/s   enters a region of space where perpendicular electric and a magnetic fields are present.The electric field is   =   .What magnetic field will allow the electron to go through the region without being deflected? 
A)     = +2.0 × 10-4 T   
B)     = -2.0 × 10-4 T   
C)     = +2.0 × 10-4 T   
D)     = -2.0 × 10-4 T   
E)     = +5.0 × 10-4 T  " class="answers-bank-image d-inline" rel="preload" > = +2.0 × 10-4 T 7 m/s   enters a region of space where perpendicular electric and a magnetic fields are present.The electric field is   =   .What magnetic field will allow the electron to go through the region without being deflected? 
A)     = +2.0 × 10-4 T   
B)     = -2.0 × 10-4 T   
C)     = +2.0 × 10-4 T   
D)     = -2.0 × 10-4 T   
E)     = +5.0 × 10-4 T  " class="answers-bank-image d-inline" rel="preload" >
B)   7 m/s   enters a region of space where perpendicular electric and a magnetic fields are present.The electric field is   =   .What magnetic field will allow the electron to go through the region without being deflected? 
A)     = +2.0 × 10-4 T   
B)     = -2.0 × 10-4 T   
C)     = +2.0 × 10-4 T   
D)     = -2.0 × 10-4 T   
E)     = +5.0 × 10-4 T  " class="answers-bank-image d-inline" rel="preload" > = -2.0 × 10-4 T 7 m/s   enters a region of space where perpendicular electric and a magnetic fields are present.The electric field is   =   .What magnetic field will allow the electron to go through the region without being deflected? 
A)     = +2.0 × 10-4 T   
B)     = -2.0 × 10-4 T   
C)     = +2.0 × 10-4 T   
D)     = -2.0 × 10-4 T   
E)     = +5.0 × 10-4 T  " class="answers-bank-image d-inline" rel="preload" >
C)   7 m/s   enters a region of space where perpendicular electric and a magnetic fields are present.The electric field is   =   .What magnetic field will allow the electron to go through the region without being deflected? 
A)     = +2.0 × 10-4 T   
B)     = -2.0 × 10-4 T   
C)     = +2.0 × 10-4 T   
D)     = -2.0 × 10-4 T   
E)     = +5.0 × 10-4 T  " class="answers-bank-image d-inline" rel="preload" > = +2.0 × 10-4 T 7 m/s   enters a region of space where perpendicular electric and a magnetic fields are present.The electric field is   =   .What magnetic field will allow the electron to go through the region without being deflected? 
A)     = +2.0 × 10-4 T   
B)     = -2.0 × 10-4 T   
C)     = +2.0 × 10-4 T   
D)     = -2.0 × 10-4 T   
E)     = +5.0 × 10-4 T  " class="answers-bank-image d-inline" rel="preload" >
D)   7 m/s   enters a region of space where perpendicular electric and a magnetic fields are present.The electric field is   =   .What magnetic field will allow the electron to go through the region without being deflected? 
A)     = +2.0 × 10-4 T   
B)     = -2.0 × 10-4 T   
C)     = +2.0 × 10-4 T   
D)     = -2.0 × 10-4 T   
E)     = +5.0 × 10-4 T  " class="answers-bank-image d-inline" rel="preload" > = -2.0 × 10-4 T 7 m/s   enters a region of space where perpendicular electric and a magnetic fields are present.The electric field is   =   .What magnetic field will allow the electron to go through the region without being deflected? 
A)     = +2.0 × 10-4 T   
B)     = -2.0 × 10-4 T   
C)     = +2.0 × 10-4 T   
D)     = -2.0 × 10-4 T   
E)     = +5.0 × 10-4 T  " class="answers-bank-image d-inline" rel="preload" >
E)   7 m/s   enters a region of space where perpendicular electric and a magnetic fields are present.The electric field is   =   .What magnetic field will allow the electron to go through the region without being deflected? 
A)     = +2.0 × 10-4 T   
B)     = -2.0 × 10-4 T   
C)     = +2.0 × 10-4 T   
D)     = -2.0 × 10-4 T   
E)     = +5.0 × 10-4 T  " class="answers-bank-image d-inline" rel="preload" > = +5.0 × 10-4 T 7 m/s   enters a region of space where perpendicular electric and a magnetic fields are present.The electric field is   =   .What magnetic field will allow the electron to go through the region without being deflected? 
A)     = +2.0 × 10-4 T   
B)     = -2.0 × 10-4 T   
C)     = +2.0 × 10-4 T   
D)     = -2.0 × 10-4 T   
E)     = +5.0 × 10-4 T  " class="answers-bank-image d-inline" rel="preload" >F) B) and E)
G) All of the above

Question 6

A charged particle of mass 0.0020 kg is subjected to a  magnetic field which acts at a right angle to its motion.If the particle moves in a circle of radius  at a speed of  what is the magnitude of the charge on the particle?

Accepted Answer

A)   0.0083 C
B)   120 C
C)   0.00040 C
D)   2500 CE) A) and D)
F) A) and B)

Question 7

The figure shows a velocity selector that can be used to measure the speed of a charged particle.A beam of particles is directed along the axis of the instrument.A parallel plate capacitor sets up an electric field E,which is oriented perpendicular to a uniform magnetic field B.If the plates are separated by 2.0 mm and the value of the magnetic field is 0.60 T,what voltage between the plates will allow particles of speed 5.0 × 105 m/s to pass straight through without deflection? 5 m/s to pass straight through without deflection?   A)  600 V B)  1900 V C)  3800 V D)  190 V E)  94 V" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   600 V
B)   1900 V
C)   3800 V
D)   190 V
E)   94 VF) B) and E)
G) C) and D)

Question 8

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.  ,mel = 9.11 × 10-31 kg)Calculate the magnitude of
(a)the magnetic force on the electron.
(b)the acceleration of the electron.

Accepted Answer

(a)2.8 × 1...

Question 9

A round loop of diameter 12 cm,carrying a current of 0.40 A,is placed inside a magnetic field -3 J B)  +2.0 × 10-3 J C)  -2.0 × 10-3 J D)  -2.3 × 10-3 J E)  +4.5 × 10-3 J" class="answers-bank-image d-inline" rel="preload" > = 0.20 T -3 J B)  +2.0 × 10-3 J C)  -2.0 × 10-3 J D)  -2.3 × 10-3 J E)  +4.5 × 10-3 J" class="answers-bank-image d-inline" rel="preload" > + 0.40 T -3 J B)  +2.0 × 10-3 J C)  -2.0 × 10-3 J D)  -2.3 × 10-3 J E)  +4.5 × 10-3 J" class="answers-bank-image d-inline" rel="preload" > .The normal to the loop is parallel to the unit vector -3 J B)  +2.0 × 10-3 J C)  -2.0 × 10-3 J D)  -2.3 × 10-3 J E)  +4.5 × 10-3 J" class="answers-bank-image d-inline" rel="preload" > What is the potential energy of the loop?

Accepted Answer

A)   -4.5 × 10-3 J
B)   +2.0 × 10-3 J
C)   -2.0 × 10-3 J
D)   -2.3 × 10-3 J
E)   +4.5 × 10-3 JF) B) and E)
G) C) and D)

Question 10

An electron moving in the direction of the +x-axis enters a magnetic field.If the electron experiences a magnetic deflection in the -y direction,the direction of the magnetic field in this region points in the direction of the

Accepted Answer

A)   +z-axis.
B)   -z-axis.
C)   -x-axis.
D)   +y-axis.
E)   -y-axis.F) D) and E)
G) A) and E)

Question 11

An electron traveling toward the north with speed 4.0 × 105 m/s enters a region where the Earth's magnetic field has the magnitude 5.0 × 10-5 T and is directed downward at 45° below horizontal.What is the magnitude of the force that the Earth's magnetic field exerts on the electron? (e = 1.60 × 10-19C

Accepted Answer

A)  2) 3 × 10-18 N
B)  3) 2 × 10-18 N
C)  2) 3 × 10-19 N
D)  3) 2 × 10-19 N
E)  2) 3 × 10-20 NF) A) and E)
G) A) and B) A

Question 12

An electron enters a magnetic field of el = 9.11 × 10-31 kg,e = 1.60 × 10-19C)  A)  2.1 × 1010 Hz B)  4.8 × 10-7 Hz C)  2.1 × 1014 Hz D)  4.8 × 10-11 Hz" class="answers-bank-image d-inline" rel="preload" > with a velocity perpendicular to the direction of the field.At what frequency does the electron traverse a circular path? (mel = 9.11 × 10-31 kg,e = 1.60 × 10-19C)

Accepted Answer

A)   2.1 × 1010 Hz
B)   4.8 × 10-7 Hz
C)   2.1 × 1014 Hz
D)   4.8 × 10-11 HzE) A) and C)
F) A) and B)

Question 13

Three particles travel through a region of space where the magnetic field is out of the page,as shown in the figure.The electric charge of each of the three particles is,respectively,

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

Question 14

A proton is first accelerated from rest through a potential difference V and then enters a uniform 0.750-T magnetic field oriented perpendicular to its path.In this field,the proton follows a circular arc having a radius of curvature of 1.84 cm.What was the potential difference V? (mproton = 1.67 × 10-27 kg,

Accepted Answer

Question 15

A wire segment 1.2 m long carries a current I = 3.5 A,and is oriented as shown in the figure.The +x-axis points directly into the page.A uniform magnetic field of magnitude 0.50 T pointing toward the -x direction is present as shown.What is the magnetic force vector on the wire segment?

Accepted Answer

A)   (+1.1  - 1.8  )  N
B)   (-1.1  + 1.8  )  N
C)   (-1.1  - 1.8  )  N
D)   (+1.8  - 1.1  )  N
E)   (-1.8  + 1.1  )  NF) B) and C)
G) None of the above

Question 16

A vertical wire carries a current vertically upward in a region where the magnetic field vector points toward the north.What is the direction of the magnetic force on this current due to the field?

Accepted Answer

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

Question 17

A uniform magnetic field of magnitude 0.80 T in the negative z direction is present in a region of space,as shown in the figure.A uniform electric field is also present and is set at 76,000 V/m in the +y direction.An electron is projected with an initial velocity  in the +x direction.The y component of the initial force on the electron is closest to which of the following quantities? (e = 1.60 × 10-19C)    A)  -2.4 × 10-14 N B)  +2.4 × 10-14 N C)  -1.0 × 10-14 N D)  +1.0 × 10-14 N E)  zero" class="answers-bank-image d-inline" rel="preload" >  in the +x direction.The y component of the initial force on the electron is closest to which of the following quantities? (e = 1.60 × 10-19C)   in the +x direction.The y component of the initial force on the electron is closest to which of the following quantities? (e = 1.60 × 10-19C)    A)  -2.4 × 10-14 N B)  +2.4 × 10-14 N C)  -1.0 × 10-14 N D)  +1.0 × 10-14 N E)  zero" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   -2.4 × 10-14 N
B)   +2.4 × 10-14 N
C)   -1.0 × 10-14 N
D)   +1.0 × 10-14 N
E)   zeroF) A) and B)
G) C) and E)

Question 18

A rigid circular loop has a radius of 0.20 m and is in the xy-plane.A clockwise current I is carried by the loop,as shown.The magnitude of the magnetic moment of the loop is  A uniform external magnetic field,B = 0.20 T in the positive x-direction,is present.An external torque changes the orientation of the loop from one of lowest potential energy to one of highest potential energy.The work done by this external torque is closest to

Accepted Answer

A)   0.20 J.
B)   0.30 J.
C)   0.40 J.
D)   0.50 J.
E)   0.60 J.F) C) and D)
G) A) and B) B

Question 19

A straight 15.0-g wire that is 2.00 m long carries a current of 8.00 A.This wire is aligned horizontally along the west-east direction with the current going from west to east.You want to support the wire against gravity using the weakest possible uniform external magnetic field.
(a)Which way should the magnetic field point?
(b)What is the magnitude of the weakest possible magnetic field you could use?

Accepted Answer

(a)from so...

Question 20

A beam of electrons is accelerated through a potential difference of 10 kV before entering a region having uniform electric and magnetic fields that are perpendicular to each other and perpendicular to the direction in which the electron is moving.If the magnetic field in this region has a value of 0.010 T,what magnitude of the electric field is required if the particles are to be undeflected as they pass through the region?

Accepted Answer

A)   2.3 × 103 V/m
B)   7.9 × 103 V/m
C)   5.9 × 105 V/m
D)   6.0 × 105 V/m
E)   7.2 × 106 V/mF) All of the above
G) A) and C)

Exam 27: Magnetic Field and Magnetic Forces

A proton starting from rest travels through a potential of 1.0 kV and then moves into a uniform 0.040-T magnetic field.What is the radius of the proton's resulting orbit? ,

Correct Answer
verified
B

Correct Answer
verified

Ions having equal charges but masses of M and 2M are accelerated through the same potential difference and then enter a uniform magnetic field perpendicular to their path.If the heavier ions follow a circular arc of radius R,what is the radius of the arc followed by the lighter?

Correct Answer
verified

Correct Answer
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(a)0.11 N perpendicular out of...
View Answer

An electron moving with a velocity = 5.0 × 10⁷ m/s enters a region of space where perpendicular electric and a magnetic fields are present.The electric field is = .What magnetic field will allow the electron to go through the region without being deflected?

Correct Answer
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A charged particle of mass 0.0020 kg is subjected to a magnetic field which acts at a right angle to its motion.If the particle moves in a circle of radius at a speed of what is the magnitude of the charge on the particle?

Correct Answer
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Correct Answer
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Correct Answer
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(a)2.8 × 1...
View Answer

A round loop of diameter 12 cm,carrying a current of 0.40 A,is placed inside a magnetic field = 0.20 T + 0.40 T .The normal to the loop is parallel to the unit vector What is the potential energy of the loop?

Correct Answer
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An electron moving in the direction of the +x-axis enters a magnetic field.If the electron experiences a magnetic deflection in the -y direction,the direction of the magnetic field in this region points in the direction of the

Correct Answer
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Correct Answer
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A

An electron enters a magnetic field of with a velocity perpendicular to the direction of the field.At what frequency does the electron traverse a circular path? (m_el = 9.11 × 10^-31 kg,e = 1.60 × 10^-19C)

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.The electric charge of each of the three particles is,respectively,

Correct Answer
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Correct Answer
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A wire segment 1.2 m long carries a current I = 3.5 A,and is oriented as shown in the figure.The +x-axis points directly into the page.A uniform magnetic field of magnitude 0.50 T pointing toward the -x direction is present as shown.What is the magnetic force vector on the wire segment?

Correct Answer
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A vertical wire carries a current vertically upward in a region where the magnetic field vector points toward the north.What is the direction of the magnetic force on this current due to the field?

Correct Answer
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Correct Answer
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Correct Answer
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B

Correct Answer
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(a)from so...
View Answer

Correct Answer
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Exam 27: Magnetic Field and Magnetic Forces

A proton starting from rest travels through a potential of 1.0 kV and then moves into a uniform 0.040-T magnetic field.What is the radius of the proton's resulting orbit? ,

Correct AnswerverifiedB

Correct AnswerverifiedShow Answer

Ions having equal charges but masses of M and 2M are accelerated through the same potential difference and then enter a uniform magnetic field perpendicular to their path.If the heavier ions follow a circular arc of radius R,what is the radius of the arc followed by the lighter?

Correct AnswerverifiedShow Answer

Correct Answerverified(a)0.11 N perpendicular out of...View AnswerShow Answer

An electron moving with a velocity = 5.0 × 107 m/s enters a region of space where perpendicular electric and a magnetic fields are present.The electric field is = .What magnetic field will allow the electron to go through the region without being deflected?

Correct AnswerverifiedShow Answer

A charged particle of mass 0.0020 kg is subjected to a magnetic field which acts at a right angle to its motion.If the particle moves in a circle of radius at a speed of what is the magnitude of the charge on the particle?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct Answerverified(a)2.8 × 1...View AnswerShow Answer

A round loop of diameter 12 cm,carrying a current of 0.40 A,is placed inside a magnetic field = 0.20 T + 0.40 T .The normal to the loop is parallel to the unit vector What is the potential energy of the loop?

Correct AnswerverifiedShow Answer

An electron moving in the direction of the +x-axis enters a magnetic field.If the electron experiences a magnetic deflection in the -y direction,the direction of the magnetic field in this region points in the direction of the

Correct AnswerverifiedShow Answer

Correct AnswerverifiedA

An electron enters a magnetic field of with a velocity perpendicular to the direction of the field.At what frequency does the electron traverse a circular path? (mel = 9.11 × 10-31 kg,e = 1.60 × 10-19C)

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.The electric charge of each of the three particles is,respectively,

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A wire segment 1.2 m long carries a current I = 3.5 A,and is oriented as shown in the figure.The +x-axis points directly into the page.A uniform magnetic field of magnitude 0.50 T pointing toward the -x direction is present as shown.What is the magnetic force vector on the wire segment?

Correct AnswerverifiedShow Answer

A vertical wire carries a current vertically upward in a region where the magnetic field vector points toward the north.What is the direction of the magnetic force on this current due to the field?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedB

Correct Answerverified(a)from so...View AnswerShow Answer

Correct AnswerverifiedShow Answer

Correct Answer
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B

Correct Answer
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Correct Answer
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Correct Answer
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(a)0.11 N perpendicular out of...
View Answer

An electron moving with a velocity = 5.0 × 10⁷ m/s enters a region of space where perpendicular electric and a magnetic fields are present.The electric field is = .What magnetic field will allow the electron to go through the region without being deflected?

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)2.8 × 1...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
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A

An electron enters a magnetic field of with a velocity perpendicular to the direction of the field.At what frequency does the electron traverse a circular path? (m_el = 9.11 × 10^-31 kg,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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Correct Answer
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B

Correct Answer
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(a)from so...
View Answer

Correct Answer
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