Question 1

If a calculated quantity has units of  NA⋅m\frac { \mathrm { N } } { \mathrm { A } \cdot \mathrm { m } }A⋅mN​ , that quantity could be

Accepted Answer

A)   a magnetic field.
B)    μ0\mu _ { 0 }μ0​ .
C)   a magnetic torque.
D)   an electric field.
E)   an electric potential.

Question 2

A geophysicist measures the magnetic force on a proton that is moving vertically downward at a point $1.996 \mathrm {~km} / \mathrm { s }$ at the earth's equator. At that Iocation, the earth's magnetic magnetic field is horizontal and has a strength of $0.40 \times 10 ^ { - 4 } \mathrm {~T}$. What are the magnitude and direction of the force she will measure? $\left( e = 1.60 \times 10 ^ { - 19 } \mathrm { C } \right)$

Accepted Answer

The answer of A geophysicist measures the magnetic force on...

Question 3

A wire in the shape of an "M" lies in the plane of the paper. It carries a current of  2.0 A2.0 \mathrm {~A}2.0 A , flowing from  AAA  to  EEE , as shown in the figure. It is placed in a uniform magnetic field of  0.85 T0.85 \mathrm {~T}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  ABA BAB  is parallel to  DED EDE  and to the baseline from which the magnetic field direction is measured. What are the magnitude and direction of the force acting on section DE of this wire?

Accepted Answer

A)    0.30 N0.30 \mathrm {~N}0.30 N  perpendicular out of the page
B)    0.30 N0.30 \mathrm {~N}0.30 N  perpendicular into the page
C)    0.20 N0.20 \mathrm {~N}0.20 N  perpendicular out of the page
D)    0.12 N0.12 \mathrm {~N}0.12 N  perpendicular into the page
E)    0.12 N0.12 \mathrm {~N}0.12 N  perpendicular out of the page

Question 4

A proton is projected with a velocity of 7.0 km/s into a magnetic field of 0.60 T perpendicular to the motion of the proton. What is the magnitude of the magnetic force that acts on the proton? (e =  1.60×10−19C1.60 	imes 10 ^ { - 19 } \mathrm { C }1.60×10−19C  )

Accepted Answer

A)    13×10−16 N13 	imes 10 ^ { - 16 } \mathrm {~N}13×10−16 N 
B)    6.7×10−16 N6.7 	imes 10 ^ { - 16 } \mathrm {~N}6.7×10−16 N 
C)    0 N0 \mathrm {~N}0 N 
D)    3.4×10−16 N3.4 	imes 10 ^ { - 16 } \mathrm {~N}3.4×10−16 N 
E)    4.2×10−16 N4.2 	imes 10 ^ { - 16 } \mathrm {~N}4.2×10−16 N

Question 5

The magnetic field at a distance of  2 cm2 \mathrm {~cm}2 cm  from a long straight current-carrying wire is  4μT4 \mu \mathrm { T }4μT . What is the magnetic field at a distance of  1 cm1 \mathrm {~cm}1 cm  from this wire?

Accepted Answer

A)    6μT6 \mu \mathrm { T }6μT 
B)    8μT8 \mu \mathrm { T }8μT 
C)    2μT2 \mu T2μT 
D)    10μT10 \mu \mathrm { T }10μT 
E)    4μT4 \mu T4μT

Question 6

Two long parallel wires separated by $7.5 \mathrm {~cm}$ each carry $3.3 \mathrm {~A}$ in opposite directions. $\left( \mu _ { 0 } = \right.$ $4 \pi \times 10 ^ { - 7 } \mathrm {~T} \cdot \mathrm { m } / \mathrm { A }$ )
(a) What magnetic force per length acts on each of the wires? Is it attractive or repulsive?
(b) Find the magnitude of the magnetic field midway between the two wires.

Accepted Answer

(a) <img  loading="lazy" src="/assets/images/blured-textbook.svg" class="d-inline m-1" alt="blured image" width="139" height="30">, repu...

Question 7

A thin copper rod 1.0 m long has a mass of 0.050 kg and is in a magnetic field of 0.10 T. What minimum current in the rod is needed in order for the magnetic force to balance the weight of the
Rod?

Accepted Answer

A)   9.8 A
B)   4.9 A
C)   2.5 A
D)   1.2 A

Question 8

Three long parallel wires each carry 2.0-A currents in the same direction. The wires are oriented vertically, and they pass through three of the corners of a horizontal square of side  4.0 cm4.0 \mathrm {~cm}4.0 cm . What is the magnitude of the magnetic field at the fourth (unoccupied)  corner of the square due to these wires?  (μ0=4π×10−7 T⋅m/A) \left( \mu _ { 0 } = 4 \pi 	imes 10 ^ { - 7 } \mathrm {~T} \cdot \mathrm { m } / \mathrm { A } ight) (μ0​=4π×10−7 T⋅m/A)

Accepted Answer

A)    12μT12 \mu \mathrm { T }12μT 
B)    21μT21 \mu \mathrm { T }21μT 
C)    2.1μT2.1 \mu T2.1μT 
D)    1.2μT1.2 \mu \mathrm { T }1.2μT 
E)    0 T0 \mathrm {~T}0 T

Question 9

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

Accepted Answer

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

Question 10

After landing on an unexplored Klingon planet, Spock tests for the direction of the magnetic field by firing a beam of electrons in various directions and by recording the following observations:
Electrons moving upward feel a magnetic force in the northwest direction.
Electrons moving horizontally toward the north are pushed downward.
Electrons moving horizontally toward the southeast are pushed upward.
Mr)  Spock therefore concludes that the magnetic field at this landing site is in which direction?

Accepted Answer

A)   toward the southeast
B)   toward the west
C)   toward the east
D)   toward the northeast
E)   toward the southwest

Question 11

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 positive, 2 is negative, and 3 is neutral.
B)   1 is negative, 2 is neutral, and 3 is positive.
C)   1 is neutral, 2 is positive, and 3 is negative.
D)   1 is neutral, 2 is negative, and 3 is positive.
E)   1 is positive, 2 is neutral, and 3 is negative.

Question 12

A straight  1.0−m1.0 - \mathrm { m }1.0−m  long wire is carrying a current. The wire is placed perpendicular to a magnetic field of strength  0.20 T0.20 \mathrm {~T}0.20 T . If the wire experiences a force of  0.60 N0.60 \mathrm {~N}0.60 N , what is the current in the wire?

Accepted Answer

A)    4.0 A4.0 \mathrm {~A}4.0 A 
B)    3.0 A3.0 \mathrm {~A}3.0 A 
C)    5.0 A5.0 \mathrm {~A}5.0 A 
D)    2.0 A2.0 \mathrm {~A}2.0 A 
E)    1.0 A1.0 \mathrm {~A}1.0 A

Question 13

Two long, parallel wires carry currents of different magnitudes. If the amount of current in one of the wires is doubled, what happens to the magnitude of the force that each wire exerts on the
Other?

Accepted Answer

A)   It is increased by a factor of 8 .
B)   It is increased by a factor of  4.4 .4. 
C)   It is increased by a factor of  2.2 .2. 
D)   It is increased by a factor of 3 .
E)   It is increased by a factor of  2\sqrt { 2 }2c-2.7,0,-7.17,-2.7,-13.5,-8c-5.8,-5.3,-9.5,-10,-9.5,-14c0,-2,0.3,-3.3,1,-4c1.3,-2.7,23.83,-20.7,67.5,-54c44.2,-33.3,65.8,-50.3,66.5,-51c1.3,-1.3,3,-2,5,-2c4.7,0,8.7,3.3,12,10s173,378,173,378c0.7,0,35.3,-71,104,-213c68.7,-142,137.5,-285,206.5,-429c69,-144,104.5,-217.7,106.5,-221l0 -0c5.3,-9.3,12,-14,20,-14H400000v40H845.2724s-225.272,467,-225.272,467s-235,486,-235,486c-2.7,4.7,-9,7,-19,7c-6,0,-10,-1,-12,-3s-194,-422,-194,-422s-65,47,-65,47zM834 80h400000v40h-400000z'/>​

Question 14

An electron moves with a speed of  3.0×104 m/s3.0 	imes 104 \mathrm {~m} / \mathrm { s }3.0×104 m/s  perpendicular to a uniform magnetic field of  0.400.400.40  T. What is the magnitude of the magnetic force on the electron?  (e=1.60×10−19C) \left( e = 1.60 	imes 10 ^ { - 19 } \mathrm { C } ight) (e=1.60×10−19C)

Accepted Answer

A)    4.8×10−14 N4.8 	imes 10 ^ { - 14 } \mathrm {~N}4.8×10−14 N 
B)    0 N0 \mathrm {~N}0 N 
C)    2.2×10−24 N2.2 	imes 10 - 24 \mathrm {~N}2.2×10−24 N 
D)    5×10−20 N5 	imes 10 - 20 \mathrm {~N}5×10−20 N 
E)    1.9×10−15 N1.9 	imes 10 - 15 \mathrm {~N}1.9×10−15 N

Question 15

Two long parallel wires placed side-by-side on a horizontal table carry identical current straight toward you. From your point of view, the magnetic field at a point exactly between the two wires

Accepted Answer

A)   is zero.
B)   points away from you.
C)   points toward you.
D)   points downward.
E)   points upward.

Question 16

A wire lying in the plane of this page carries a current directly toward the top of the page. What is the direction of the magnetic force this current produces on an electron that is moving
Perpendicular to the page and outward from it on the left side of the wire?

Accepted Answer

A)   toward the bottom of the page
B)   toward the top of the page
C)   perpendicular to the page and towards you
D)   perpendicular to the page and away from you
E)   The force is zero.

Question 17

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

Accepted Answer

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

Question 18

A flat circular loop of wire is in a uniform magnetic field of  0.30 T0.30 \mathrm {~T}0.30 T . The diameter of the loop is  1.01.01.0   m\mathrm { m }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 magnetic field?

Accepted Answer

A)    0.00 N⋅m0.00 \mathrm {~N} \cdot \mathrm { m }0.00 N⋅m 
B)    0.47 N⋅m0.47 \mathrm {~N} \cdot \mathrm { m }0.47 N⋅m 
C)    0.52 N⋅m0.52 \mathrm {~N} \cdot \mathrm { m }0.52 N⋅m 
D)    0.41 N⋅m0.41 \mathrm {~N} \cdot \mathrm { m }0.41 N⋅m

Question 19

An electron traveling toward the magnetic north with speed $400 \mathrm {~km} / \mathrm { s }$ enters a region where the earth's magnetic field has the magnitude $5.0 \times 10 ^ { - 5 } \mathrm {~T}$ and is directed downward at $45 ^ { \circ }$ below horizontal. What magnitude magnetic force acts on the electron? $\left( e = 1.60 \times 10 ^ { - 19 } \mathrm { C } \right)$

Accepted Answer

The answer of An electron traveling toward the magnetic north...

Question 20

An electron moving along the +x-axis enters a magnetic field. If the electron experiences a magnetic deflection in the -y direction, then the magnetic field must have a component

Accepted Answer

A)   along the -y-axis
B)   along the +y-axis
C)   along the -x-axis
D)   along the -z-axis
E)   along the +z-axis

Exam 20: Magnetism

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

Correct Answer
verified

An electron moves with a speed of $3.0 \times 104 \mathrm {~m} / \mathrm { s }$ perpendicular to a uniform magnetic field of $0.40$ T. What is the magnitude of the magnetic force on the electron? $\left( e = 1.60 \times 10 ^ { - 19 } \mathrm { C } \right)$

Correct Answer
verified

A straight $1.0 - \mathrm { m }$ long wire is carrying a current. The wire is placed perpendicular to a magnetic field of strength $0.20 \mathrm {~T}$ . If the wire experiences a force of $0.60 \mathrm {~N}$ , what is the current in the wire?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The magnetic field at a distance of $2 \mathrm {~cm}$ from a long straight current-carrying wire is $4 \mu \mathrm { T }$ . What is the magnetic field at a distance of $1 \mathrm {~cm}$ from this wire?

Correct Answer
verified

If a calculated quantity has units of $\frac { \mathrm { N } } { \mathrm { A } \cdot \mathrm { m } }$ , that quantity could be

Correct Answer
verified

Two long, parallel wires carry currents of different magnitudes. If the amount of current in one of the wires is doubled, what happens to the magnitude of the force that each wire exerts on the Other?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
(a) , repu...
View Answer

Correct Answer
verified

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
verified

A flat circular loop of wire is in a uniform magnetic field of $0.30 \mathrm {~T}$ . The diameter of the loop is $1.0$ $\mathrm { m }$ , 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 magnetic field?

Correct Answer
verified

A wire lying in the plane of this page carries a current directly toward the top of the page. What is the direction of the magnetic force this current produces on an electron that is moving Perpendicular to the page and outward from it on the left side of the wire?

Correct Answer
verified

Correct Answer
verified

A proton is projected with a velocity of 7.0 km/s into a magnetic field of 0.60 T perpendicular to the motion of the proton. What is the magnitude of the magnetic force that acts on the proton? (e = $1.60 \times 10 ^ { - 19 } \mathrm { C }$ )

Correct Answer
verified

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

Correct Answer
verified

An electron moving along the +x-axis enters a magnetic field. If the electron experiences a magnetic deflection in the -y direction, then the magnetic field must have a component

Correct Answer
verified

Two long parallel wires placed side-by-side on a horizontal table carry identical current straight toward you. From your point of view, the magnetic field at a point exactly between the two wires

Correct Answer
verified

A thin copper rod 1.0 m long has a mass of 0.050 kg and is in a magnetic field of 0.10 T. What minimum current in the rod is needed in order for the magnetic force to balance the weight of the Rod?

Correct Answer
verified

Exam 20: Magnetism

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

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A straight 1.0−m1.0 - \mathrm { m }1.0−m long wire is carrying a current. The wire is placed perpendicular to a magnetic field of strength 0.20 T0.20 \mathrm {~T}0.20 T . If the wire experiences a force of 0.60 N0.60 \mathrm {~N}0.60 N , what is the current in the wire?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The magnetic field at a distance of 2 cm2 \mathrm {~cm}2 cm from a long straight current-carrying wire is 4μT4 \mu \mathrm { T }4μT . What is the magnetic field at a distance of 1 cm1 \mathrm {~cm}1 cm from this wire?

Correct AnswerverifiedShow Answer

If a calculated quantity has units of NA⋅m\frac { \mathrm { N } } { \mathrm { A } \cdot \mathrm { m } }A⋅mN​ , that quantity could be

Correct AnswerverifiedShow Answer

Two long, parallel wires carry currents of different magnitudes. If the amount of current in one of the wires is doubled, what happens to the magnitude of the force that each wire exerts on the Other?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct Answerverified(a) , repu...View AnswerShow 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

Correct AnswerverifiedShow Answer

A wire lying in the plane of this page carries a current directly toward the top of the page. What is the direction of the magnetic force this current produces on an electron that is moving Perpendicular to the page and outward from it on the left side of the wire?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A proton is projected with a velocity of 7.0 km/s into a magnetic field of 0.60 T perpendicular to the motion of the proton. What is the magnitude of the magnetic force that acts on the proton? (e = 1.60×10−19C1.60 \times 10 ^ { - 19 } \mathrm { C }1.60×10−19C )

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

An electron moving along the +x-axis enters a magnetic field. If the electron experiences a magnetic deflection in the -y direction, then the magnetic field must have a component

Correct AnswerverifiedShow Answer

Two long parallel wires placed side-by-side on a horizontal table carry identical current straight toward you. From your point of view, the magnetic field at a point exactly between the two wires

Correct AnswerverifiedShow Answer

A thin copper rod 1.0 m long has a mass of 0.050 kg and is in a magnetic field of 0.10 T. What minimum current in the rod is needed in order for the magnetic force to balance the weight of the Rod?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

A straight $1.0 - \mathrm { m }$ long wire is carrying a current. The wire is placed perpendicular to a magnetic field of strength $0.20 \mathrm {~T}$ . If the wire experiences a force of $0.60 \mathrm {~N}$ , what is the current in the wire?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The magnetic field at a distance of $2 \mathrm {~cm}$ from a long straight current-carrying wire is $4 \mu \mathrm { T }$ . What is the magnetic field at a distance of $1 \mathrm {~cm}$ from this wire?

Correct Answer
verified

If a calculated quantity has units of $\frac { \mathrm { N } } { \mathrm { A } \cdot \mathrm { m } }$ , that quantity could be

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
(a) , repu...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A proton is projected with a velocity of 7.0 km/s into a magnetic field of 0.60 T perpendicular to the motion of the proton. What is the magnitude of the magnetic force that acts on the proton? (e = $1.60 \times 10 ^ { - 19 } \mathrm { C }$ )

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified