One long wire carries a current of 14 A along the entire {image} axis. A second long wire carries a current of 48 A perpendicular to the {image} plane and passes through the point (0, 4, 0) m. What is the magnitude of the resulting magnetic field at the - PowerPoint PPT Presentation

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One long wire carries a current of 14 A along the entire {image} axis. A second long wire carries a current of 48 A perpendicular to the {image} plane and passes through the point (0, 4, 0) m. What is the magnitude of the resulting magnetic field at the

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These two currents are oppositely directed. ... 4.2 mm each carry a current of 40 A. These two currents are oppositely directed. ... – PowerPoint PPT presentation

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Title: One long wire carries a current of 14 A along the entire {image} axis. A second long wire carries a current of 48 A perpendicular to the {image} plane and passes through the point (0, 4, 0) m. What is the magnitude of the resulting magnetic field at the


1
One long wire carries a current of 14 A along the
entire image axis. A second long wire carries a
current of 48 A perpendicular to the image
plane and passes through the point (0, 4, 0) m.
What is the magnitude of the resulting magnetic
field at the point image on the image axis?
  1. image
  2. image
  3. image
  4. image
  5. image

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
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2
A 2.0-cm length of wire centered on the origin
carries a 21-A current directed in the positive
image direction. Determine the magnetic field
at the point image on the image -axis.
  1. 1.2 nT in the negative image direction
  2. 1.2 nT in the positive image direction
  3. 2.0 nT in the negative image direction
  4. 2.0 nT in the positive image direction
  5. None of the above

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3
Each of two long straight parallel wires
separated by a distance of 16 cm carries a
current of 17 A in the same direction. What is
the magnitude of the resulting magnetic field at
a point that is 12 cm from each wire?
  1. image
  2. image
  3. image
  4. image
  5. image

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4
Two long parallel wires carry unequal currents in
the same direction. The ratio of the currents is
4 to 1. The magnitude of the magnetic field at a
point in the plane of the wires and 10 cm from
each wire is image What is the larger of the
two currents?
  1. 4.0 A
  2. 3.0 A
  3. 0.7 A
  4. 7.0 A
  5. 8.0 A

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5
Each of two parallel wires separated by 8.5 mm
carries a 20-A current. These two currents are
oppositely directed. Determine the magnitude of
the magnetic field at a point that is 5.0 mm from
each of the wires.
  1. 1.4 mT
  2. 1.7 mT
  3. 1.5 mT
  4. 1.9 mT
  5. 2.2 mT

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6
Two long parallel wires separated by 4.2 mm each
carry a current of 40 A. These two currents are
oppositely directed. What is the magnitude of the
magnetic field at a point that is between the two
wires and 2.5 mm from one of the two wires?
  1. 7.9 mT
  2. 8.1 mT
  3. 7.4 mT
  4. 8.9 mT
  5. 9.1 mT

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7
Two long parallel wires separated by 4.3 mm each
carry a current of 28 A. These two currents are
in the same direction. What is the magnitude of
the magnetic field at a point that is between the
two wires and 1.1 mm from one of the two wires?
  1. 3.3 mT
  2. 3.8 mT
  3. 3.9 mT
  4. 4.3 mT
  5. 1.5 mT

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8
Two long parallel wires carry unequal currents in
opposite directions. The ratio of the currents is
2 to 5. The magnitude of the magnetic field at a
point in the plane of the wires and 11 cm from
each wire is image What is the larger of the
two currents?
  1. 1.8 A
  2. 1.5 A
  3. 1.4 A
  4. 2.3 A
  5. 2.7 A

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9
A segment of wire of total length 2.4 m is formed
into a circular loop having 4.0 turns. If the
wire carries a 1.8-A current, determine the
magnitude of the magnetic field at the center of
the loop.
  1. image
  2. image
  3. image
  4. image
  5. image

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10
If image and image what is the magnitude of
the magnetic field at point image ? applet
  1. 0.39 mT
  2. 0.44 mT
  3. 0.49 mT
  4. 0.50 mT
  5. 0.54 mT

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11
In the figure, if image and image what is the
magnitude of the magnetic field at point image
applet
  1. image
  2. image
  3. image
  4. image
  5. image

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12
A segment of wire (total length image ) is
formed into the shape shown and carries a current
image What is the magnitude of the resulting
magnetic field at the point image ? applet
  1. image
  2. image
  3. image
  4. image
  5. image

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13
What is the magnitude of the magnetic field at
point image if image and image applet
  1. image
  2. image
  3. image
  4. image
  5. image

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14
What is the magnitude of the magnetic field at
point image in the figure if image and
image applet
  1. image into the paper
  2. image out of the paper
  3. image into the paper
  4. image out of the paper
  5. image out of the paper

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15
Two long parallel wires are separated by 6.1 mm.
The current in one of the wires is twice the
other current. If the magnitude of the force on a
2.6-m length of one of the wires is equal to
image what is the greater of the two currents?
  1. 0.44 A
  2. 0.22 A
  3. 0.49 A
  4. 44 mA
  5. 22 mA

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16
Three long, straight, parallel wires all lie in
the image plane and each carries a current of
21 A in the positive image direction. The two
outer wires are each 4.0 cm from the center wire.
What is the magnitude of the magnetic force on a
60-cm length of either of the outer wires?
  1. 2 mN
  2. 2.2 mN
  3. 2.3 mN
  4. 1.5 mN
  5. 2.7 mN

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17
A long straight wire (diameter 2.5 mm) carries
a current of 30 A. What is the magnitude of the
magnetic field 2.0 mm from the axis of the wire?
  1. 3.0 mT
  2. 3.5 mT
  3. 2.4 mT
  4. 2.0 mT
  5. 4.1 mT

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18
The figure below shows a cross section of three
parallel wires each carrying a current of 16 A.
The currents in wires image and image are out
of the paper, while that in wire image is into
the paper. If the distance image what is the
magnitude of the force on a 2.1-m length of wire
image applet
  1. 22 mN
  2. 24 mN
  3. 25 mN
  4. 27 mN
  5. 16 mN

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19
The figure shows a cross section of three
parallel wires each carrying a current of 24 A.
The currents in wires image and image are out
of the paper, while that in wire image is into
the paper. If the distance image , what is the
magnitude of the force on a 3.4-m length of wire
image ? applet
  1. 67 mN
  2. 59 mN
  3. 75 mN
  4. 55 mN
  5. 87 mN

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20
A hollow cylindrical conductor (inner radius
1.0 mm, outer radius 3.0 mm) carries a current
of 90.0 A parallel to its axis. This current is
uniformly distributed over a cross section of the
conductor. Determine the magnitude of the
magnetic field at a point that is 1.9 mm from the
axis of the conductor.
  1. 3.1 mT
  2. 3.4 mT
  3. 2.6 mT
  4. 4.2 mT
  5. 16 mT

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21
A long straight wire (diameter 2.4 mm) carries
a current of 27 A. What is the magnitude of the
magnetic field 0.70 mm from the axis of the wire?
  1. 2.6 mT
  2. 2.4 mT
  3. 30 mT
  4. 0.18 mT
  5. 0.17 mT

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22
A long hollow cylindrical conductor (inner radius
2.0 mm, outer radius 3.5 mm) carries a
current of 20 A distributed uniformly across its
cross section. A long wire which is coaxial with
the cylinder carries an equal current in the
opposite direction. What is the magnitude of the
magnetic field 3.1 mm from the axis?
  1. 0.41 mT
  2. 0.35 mT
  3. 0.31 mT
  4. 0.29 mT
  5. 0.13 mT

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
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23
A long, straight wire (radius 2.2 mm) carries a
current of 3.9 A distributed uniformly over a
cross section perpendicular to the axis of the
wire. What is the magnitude of the magnetic field
at a distance of 1.3 mm from the axis of the wire?
  1. 0.21 mT
  2. 0.18 mT
  3. 0.24 mT
  4. 0.26 mT
  5. 0.15 mT

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
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24
A long wire carries a current of 3.2 A along the
axis of a long solenoid (radius 3.3 cm, image
current 31 mA). What is the magnitude of the
magnetic field at a point 1.9 cm from the axis of
the solenoid? Neglect any end effects.
  1. image
  2. image
  3. image
  4. image
  5. image

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25
A long solenoid (diameter 5.1 cm) is wound with
910 turns per meter of thin wire through which a
current of 280 mA is maintained. A wire carrying
15 A is inserted along the axis of the solenoid.
What is the magnitude of the magnetic field at a
point 2.1 cm from the axis?
  1. 0.35 mT
  2. 0.40 mT
  3. 0.28 mT
  4. 0.48 mT
  5. 0.16 mT

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
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26
A long solenoid (1,200 turns/m) carries a current
of 30 mA and has an inside radius of 1.9 cm. A
long wire which is parallel to and 3.5 cm from
the axis of the solenoid carries a current of 6.7
A. What is the magnitude of the magnetic field at
a point on the axis of the solenoid?
  1. image
  2. image
  3. image
  4. image
  5. image

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27
A long solenoid (1,400 turns/m) carries a current
of 16 mA and has an inside diameter of 3.3 cm. A
long wire carries a current of 2.2 A along the
axis of the solenoid. What is the magnitude of
the magnetic field at a point that is inside the
solenoid and 1.2 cm from the wire?
  1. image
  2. image
  3. image
  4. image
  5. image

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28
A single circular (radius image ) loop of
wire is located in the image plane with its
center at the origin. The loop has a clockwise
current as seen from the point image The
direction of the magnetic field at the point ___.
  1. image is image and at the point image is
    image
  2. image is image and at the point image is
    image
  3. image is image and at the point image is
    image
  4. image is image and at the point image is
    image
  5. None of the above

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29
A conducting rod with a square cross section
image carries a current of 71 A that is
uniformly distributed across the cross section.
What is the magnitude of the (line) integral
image around a square path image if the path
is centered on the center of the rod and lies in
a plane perpendicular to the axis of the rod?
  1. image
  2. image
  3. image
  4. image
  5. image

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30
Which diagram correctly shows the magnetic field
lines created by a circular current loop through
which current flows in the direction shown?
  1. applet
  2. applet
  3. applet
  4. applet
  5. applet

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31
When the number of turns in a solenoid and its
length are both doubled, what is the ratio of the
magnitude of the new magnetic field inside to the
magnitude of the original magnetic field inside?
  1. 1
  2. 2
  3. 0.5
  4. 0.25
  5. 4

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32
The reason the south pole of a bar magnet free to
rotate points south is because _____ .
  1. the south geographic pole of the earth is the
    earth's magnetic north pole
  2. the north geographic pole of the earth is the
    earth's magnetic north pole
  3. there is a net accumulation of negative magnetic
    charge at the earth's south geographic pole
  4. there is a net accumulation of positive magnetic
    charge at the earth's north geographic pole
  5. the south geographic pole of the earth is the
    earth's magnetic south pole

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33
At a point in space where the magnetic field is
measured, the magnetic field produced by a
current element _____ .
  1. points in a direction that is perpendicular to
    the current element and perpendicular to the
    radial direction
  2. points radially in the direction from the point
    in space towards the current element
  3. points in a direction parallel to the current
    element
  4. points in a direction parallel to but opposite in
    direction to the current element
  5. points radially away in the direction from the
    current element to the point in space

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34
A toroid is made of 2,400 turns of wire of radius
2.10 cm formed into a donut shape of inner radius
10.1 cm and outer radius 14.3 cm. When a 36.0-A
current is present in the toroid, the magnetic
field at a distance of 10.5 cm from the center of
the toroid is _____ .
  1. 0.165 T
  2. 0.160 T
  3. 0.145 T
  4. 0.143 T
  5. 0.207 T

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35
A 0.60-m long solenoid consists of 1,000 turns of
copper wire wound with a 4.4 cm radius. When the
current in the solenoid is 17 A, what is the
magnetic field at a point 1.0 cm from the central
axis of the solenoid?
  1. 36 mT
  2. 33 mT
  3. 23 mT
  4. 0.36 mT
  5. 0.33 mT

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36
A thin infinitely large current sheet lies in the
image plane. Current of magnitude image per
unit length along the image axis travels in the
negative image -axis direction, which is up out
of the page. Which diagram below correctly
represents the direction of the magnetic field on
either side of the sheet?
  1. applet
  2. applet
  3. applet
  4. applet
  5. applet

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37
What magnitude image does have the magnetic
field strength image have within a solenoid
with image turns per unit length (length
image )?
  1. image
  2. image
  3. image
  4. image
  5. image

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38
Equal currents of magnitude image travel into
the page in wire image and out of the page in
wire image Eight directions are indicated by
letters image through image applet
  1. image
  2. image
  3. image
  4. image
  5. image

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
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39
Equal currents of magnitude image travel out of
the page in wire image and into the page in
wire image Eight directions are indicated by
letters image through image applet
  1. image
  2. image
  3. image
  4. image
  5. image

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40
Consider the current in the length of wire shown
in the figure below. Rank the points image and
image in terms of magnitude of the magnetic
field due to the current in the length element
shown, from greatest to least. image
  1. image
  2. image
  3. image
  4. image
  5. image

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41
A loose spiral spring is hung from the ceiling,
and a large current is sent through it. The coils
move _____.
  1. closer together
  2. farther apart
  3. they do not move at all

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42
Rank the magnitudes of image for the closed
paths in the figure below, from least to
greatest. image
  1. image
  2. image
  3. image
  4. image
  5. image

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43
In an image circuit, the capacitor begins to
discharge. During the discharge, in the region of
space between the plates of the capacitor, there
is _____.
  1. conduction current but no displacement current
  2. displacement current but no conduction current
  3. both conduction and displacement current
  4. no current of any type

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