Question 1

What is the strength of the magnetic field at the center of a circular loop of wire of diameter 8.0 cm when a current of 2.0 A flows in the wire? (?0 = 4? × 10-7 T ? m/A)

Accepted Answer

Question 2

An ideal solenoid is wound with 470 turns on a wooden form that is 4.0 cm in diameter and 50 cm long. The windings carry a current in the sense shown in the figure. The current produces a magnetic field of magnitude  4.1mT, 4.1 \mathrm { mT } 	ext {, }4.1mT,   at the center of the solenoid. What is the current I in the solenoid windings? (?0 = 4? × 10-7 T ? m/A)  0 = 4? × 10-7 T ? m/A)    A) 3.5 A B) 3.0 A C) 2.6 A D) 4.3 A E) 3.9 A " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  3.5 A
B)  3.0 A
C)  2.6 A
D)  4.3 A
E)  3.9 A

Question 3

Two long parallel wires separated by 7.5 cm each carry 3.3 A in opposite directions. (?0 = 4? × 10-7 T ? m/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)2.9 × <img  loading="lazy" src="/assets/images/blured-textbook.svg" class="d-inline m-1" alt="blured image" width="139" height="30"> ...

Question 4

Two long parallel wires placed side-by-side on a horizontal table carry identical size currents in opposite directions. The wire on your right carries current directly toward you, and the wire on your left carries current directly away from you. From your point of view, the magnetic field at a point exactly midway between the two wires

Accepted Answer

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

Question 5

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.

Question 6

Consider an ideal solenoid of length L, N windings, and radius b (L is much longer than b) . A current I is flowing through the wire windings. If the length of the solenoid becomes twice as long (to 2L) , but all other quantities remained the same, the magnetic field inside the solenoid will

Accepted Answer

A)  remain the same.
B)  become twice as strong as initially.
C)  become one-half as strong as initially.
D)  become four times as strong as initially.
E)  become one-fourth as strong as initially.

Question 7

A long straight wire carrying a 4-A current is placed along the x-axis as shown in the figure. What is the magnitude of the magnetic field at a point P, located at y = 2 cm, due to the current in this wire? (μ0 = 4π × 10-7 T ∙ m/A)  0 = 4π × 10-7 T ∙ m/A)    A) 20 μT B) 30 μT C) 40 μT D) 50 μT E) 60 μT" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  20 μT
B)  30 μT
C)  40 μT
D)  50 μT
E)  60 μT

Question 8

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 0.75 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 AB of this wire?

Accepted Answer

A)  0.20 N perpendicular out of the page
B)  0.40 N perpendicular out of the page
C)  0.11 N perpendicular out of the page
D)  0.20 N perpendicular into the page
E)  0.11 N perpendicular into the page

Question 9

An electron moving in the +y direction, at right angles to a magnetic field, experiences a magnetic force in the -x direction. The direction of the magnetic field is in the

Accepted Answer

A)  -x direction.
B)  +x direction.
C)  +y direction.
D)  -z direction.
E)  +z direction.

Question 10

Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions. The wires are separated by 20 cm. At what point between the two wires do they produce the same strength magnetic field?

Accepted Answer

A)  4.0 cm from the 20 A wire
B)  8.0 cm from the 20 A wire
C)  12 cm from the 20 A wire
D)  16 cm from the 20 A wire
E)  18 cm from the 20 A wire

Question 11

A charged particle moves with a constant speed through a region where a uniform magnetic field is present. If the magnetic field points straight upward, the magnetic force acting on this particle will be strongest when the particle moves

Accepted Answer

A)  straight upward.
B)  straight downward.
C)  in a plane parallel to Earth's surface.
D)  upward at an angle of 45° above the horizontal.

Question 12

A 2.0-m straight wire carrying a current of 0.60 A is oriented parallel to a uniform magnetic field of 0.50 T. What is the magnitude of the magnetic force on it?

Accepted Answer

A)  zero
B)  0.15 N
C)  0.30 N
D)  0.60 N

Question 13

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 m

Question 14

A charged particle of mass 0.0040 kg is subjected to a  4.0−T4.0 - \mathrm { T }4.0−T  magnetic field which acts at a right angle to its motion. If the particle moves in a circle of radius  0.10 m0.10 \mathrm {~m}0.10 m  at a speed of  2.0 m/s, 2.0 \mathrm {~m} / \mathrm { s } 	ext {, }2.0 m/s,   what is the magnitude of the charge on the particle?

Accepted Answer

A)  0.020 C
B)  50 C
C)  0.00040 C
D)  2500 C

Question 15

A charged particle moving along the +x-axis enters a uniform magnetic field pointing along the +z-axis. Because of an electric field along the +y-axis, the charge particle does not change velocity. What is the sign of this particle?

Accepted Answer

A)  positive
B)  negative
C)  The particle could be either positive or negative.
D)  None of the above choices is correct.

Question 16

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 CD 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.

Question 17

A current-carrying loop of wire lies flat on a horizontal tabletop. When viewed from above, the current moves around the loop in a counterclockwise sense. For points on the tabletop outside the loop, the magnetic field lines caused by this current

Accepted Answer

A)  circle the loop in a clockwise direction.
B)  circle the loop in a counterclockwise direction.
C)  point straight up.
D)  point straight down.

Question 18

In the figure, the two long straight wires are separated by a distance of $d = 0.40 \mathrm {~m} .$ The currents are $I _ { 1 }$ = 1.0 A to the right in the upper wire and $I _ { 2 }$ = 8.0 A to the left in the lower wire. What are the magnitude and direction of the magnetic field at point P, that is a distance $d / 2 = 0.20 \mathrm {~m}$ below the lower wire? (?0 = 4? × 10-7 T ? m/A)

Accepted Answer

Question 19

The magnetic field due to the current in a long, straight wire is 8.0 μT at a distance of 4.0 cm from the center of the wire. What is the current in the wire? (μ0 = 4π × 10-7 T ∙ m/A)

Accepted Answer

A)  0.20 A
B)  0.40 A
C)  0.80 A
D)  3.2 A
E)  1.6 A

Question 20

How much current must pass through a 400-turn ideal solenoid that is 4.0 cm long to generate a 1.0-T magnetic field at the center? (μ0 = 4π × 10-7 T ∙ m/A)

Accepted Answer

A)  0.013 A
B)  13 A
C)  22 A
D)  40 A
E)  80 A

Exam 24: Magnetic Fields and Forces

How much current must pass through a 400-turn ideal solenoid that is 4.0 cm long to generate a 1.0-T magnetic field at the center? (μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
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Consider an ideal solenoid of length L, N windings, and radius b (L is much longer than b) . A current I is flowing through the wire windings. If the length of the solenoid becomes twice as long (to 2L) , but all other quantities remained the same, the magnetic field inside the solenoid will

Correct Answer
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What is the strength of the magnetic field at the center of a circular loop of wire of diameter 8.0 cm when a current of 2.0 A flows in the wire? (?₀ = 4? × 10^-7 T ? m/A)

Correct Answer
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The magnetic field due to the current in a long, straight wire is 8.0 μT at a distance of 4.0 cm from the center of the wire. What is the current in the wire? (μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
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A charged particle moves with a constant speed through a region where a uniform magnetic field is present. If the magnetic field points straight upward, the magnetic force acting on this particle will be strongest when the particle moves

Correct Answer
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A current-carrying loop of wire lies flat on a horizontal tabletop. When viewed from above, the current moves around the loop in a counterclockwise sense. For points on the tabletop outside the loop, the magnetic field lines caused by this current

Correct Answer
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Correct Answer
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Correct Answer
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A 2.0-m straight wire carrying a current of 0.60 A is oriented parallel to a uniform magnetic field of 0.50 T. What is the magnitude of the magnetic force on it?

Correct Answer
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An electron moving in the +y direction, at right angles to a magnetic field, experiences a magnetic force in the -x direction. The direction of the magnetic field is in the

Correct Answer
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Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions. The wires are separated by 20 cm. At what point between the two wires do they produce the same strength magnetic field?

Correct Answer
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Correct Answer
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Two long parallel wires separated by 7.5 cm each carry 3.3 A in opposite directions. (?₀ = 4? × 10^-7 T ? m/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.

Correct Answer
verified
(a)2.9 × ...
View Answer

Correct Answer
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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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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 CD of this coil?

Correct Answer
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A long straight wire carrying a 4-A current is placed along the x-axis as shown in the figure. What is the magnitude of the magnetic field at a point P, located at y = 2 cm, due to the current in this wire? (μ₀ = 4π × 10^-7 T ∙ m/A)

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
verified

A charged particle moving along the +x-axis enters a uniform magnetic field pointing along the +z-axis. Because of an electric field along the +y-axis, the charge particle does not change velocity. What is the sign of this particle?

Correct Answer
verified

Exam 24: Magnetic Fields and Forces

How much current must pass through a 400-turn ideal solenoid that is 4.0 cm long to generate a 1.0-T magnetic field at the center? (μ0 = 4π × 10-7 T ∙ m/A)

Correct AnswerverifiedShow Answer

Consider an ideal solenoid of length L, N windings, and radius b (L is much longer than b) . A current I is flowing through the wire windings. If the length of the solenoid becomes twice as long (to 2L) , but all other quantities remained the same, the magnetic field inside the solenoid will

Correct AnswerverifiedShow Answer

What is the strength of the magnetic field at the center of a circular loop of wire of diameter 8.0 cm when a current of 2.0 A flows in the wire? (?0 = 4? × 10-7 T ? m/A)

Correct AnswerverifiedShow Answer

The magnetic field due to the current in a long, straight wire is 8.0 μT at a distance of 4.0 cm from the center of the wire. What is the current in the wire? (μ0 = 4π × 10-7 T ∙ m/A)

Correct AnswerverifiedShow Answer

A charged particle moves with a constant speed through a region where a uniform magnetic field is present. If the magnetic field points straight upward, the magnetic force acting on this particle will be strongest when the particle moves

Correct AnswerverifiedShow Answer

A current-carrying loop of wire lies flat on a horizontal tabletop. When viewed from above, the current moves around the loop in a counterclockwise sense. For points on the tabletop outside the loop, the magnetic field lines caused by this current

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A 2.0-m straight wire carrying a current of 0.60 A is oriented parallel to a uniform magnetic field of 0.50 T. What is the magnitude of the magnetic force on it?

Correct AnswerverifiedShow Answer

An electron moving in the +y direction, at right angles to a magnetic field, experiences a magnetic force in the -x direction. The direction of the magnetic field is in the

Correct AnswerverifiedShow Answer

Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions. The wires are separated by 20 cm. At what point between the two wires do they produce the same strength magnetic field?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Two long parallel wires separated by 7.5 cm each carry 3.3 A in opposite directions. (?0 = 4? × 10-7 T ? m/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.

Correct Answerverified(a)2.9 × ...View AnswerShow Answer

Correct AnswerverifiedShow Answer

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 AnswerverifiedShow Answer

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 CD of this coil?

Correct AnswerverifiedShow Answer

A long straight wire carrying a 4-A current is placed along the x-axis as shown in the figure. What is the magnitude of the magnetic field at a point P, located at y = 2 cm, due to the current in this wire? (μ0 = 4π × 10-7 T ∙ m/A)

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

A charged particle moving along the +x-axis enters a uniform magnetic field pointing along the +z-axis. Because of an electric field along the +y-axis, the charge particle does not change velocity. What is the sign of this particle?

Correct AnswerverifiedShow Answer

How much current must pass through a 400-turn ideal solenoid that is 4.0 cm long to generate a 1.0-T magnetic field at the center? (μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
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Correct Answer
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What is the strength of the magnetic field at the center of a circular loop of wire of diameter 8.0 cm when a current of 2.0 A flows in the wire? (?₀ = 4? × 10^-7 T ? m/A)

Correct Answer
verified

The magnetic field due to the current in a long, straight wire is 8.0 μT at a distance of 4.0 cm from the center of the wire. What is the current in the wire? (μ₀ = 4π × 10^-7 T ∙ m/A)

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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Correct Answer
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Two long parallel wires separated by 7.5 cm each carry 3.3 A in opposite directions. (?₀ = 4? × 10^-7 T ? m/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.

Correct Answer
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(a)2.9 × ...
View Answer

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 long straight wire carrying a 4-A current is placed along the x-axis as shown in the figure. What is the magnitude of the magnetic field at a point P, located at y = 2 cm, due to the current in this wire? (μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
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Correct Answer
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Correct Answer
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