Phys 1114: Assignm ent 9 Abbott (5420633)
Due:
Mon Apr 7 2014 11:59 PM CDT
Question
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Question Details
C 14: Magnetic Field Direction Abbott [2861537]
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a) A wire is oriented horizontally along the north-south direction and a compass is placed directly above it with the needle
facing north. When a current in the wire flows north will the needle of the compass deflect and if so, in what direction?
Yes, the needle will deflect directly toward the west.
No, the needle will not deflect.
Yes, the needle will deflect toward the east.
Yes, the needle will deflect directly toward the south.
b) A wire is oriented horizontally along the east-west direction and a compass is placed directly above it with the needle
facing north. When a current in the wire flows west will the needle of the compass deflect and if so, in what direction?
Yes, the needle will deflect toward the east.
Yes, the needle will deflect directly toward the south.
Yes, the needle will deflect directly toward the west.
No, the needle will not deflect.
2.
Question Details
C 14: Field direction from circular loop Abbott [2861538]
a) A circular loop of wire is placed so its plane is parallel to the earth's surface horizonatlly. When viewed from above, the
wire has a current moving in the counter-clockwise direction. What is the direction of the magnetic field at the center of the
circular loop of wire?
no magnetic field
clockwise
down
up
counterclockwise
b) If you think of this circular loop of wire as a little bar magnet, which direction is the north pole of the magnet facing?
north
west
down
east
up
south
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3.
Question Details
C 14: Magnetic force direction on particle Abbott [2861540]
a) A uniform magnetic field is directed horizontally toward the north, and a positive charge is moving west through this field.
Is there a magnetic force on this charge, and if so, in what direction?
Yes, the magnetic force on the charge is directed downward.
Yes, the magnetic force on the charge is directed westward.
Yes, the magnetic force on the charge is directed eastward.
No, there is no magnetic force on the charge.
Yes, the magnetic force on the charge is directed upward.
b) A uniform magnetic field is directed horizontally toward the north, and a negative charge is moving west through this field.
Is there a magnetic force on this charge, and if so, in what direction?
Yes, the magnetic force on the charge is directed upward.
Yes, the magnetic force on the charge is directed eastward.
Yes, the magnetic force on the charge is directed westward.
Yes, the magnetic force on the charge is directed downward.
No, there is no magnetic force on the charge.
c) A uniform magnetic field is directed horizontally toward the north, and a postive charge is moving south through this field.
Is there a magnetic force on this charge, and if so, in what direction?
No, there is no magnetic force on the charge.
Yes, the magnetic force on the charge is directed westward.
Yes, the magnetic force on the charge is directed upward.
Yes, the magnetic force on the charge is directed downward.
Yes, the magnetic force on the charge is directed eastward.
d) A uniform magnetic field is directed horizontally toward the north, and a negative charge is sitting in the field but not
moving. Is there a magnetic force on this charge, and if so, in what direction?
Yes, the magnetic force on the charge is directed westward.
Yes, the magnetic force on the charge is directed upward.
No, there is no magnetic force on the charge.
Yes, the magnetic force on the charge is directed downward.
Yes, the magnetic force on the charge is directed eastward.
e) A particle moving directly upward is deflected to the east by a magnetic field pointing north. What is the charge on the
particle?
There is not enough information given to decide.
neutral
positive
negative
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4.
Question Details
C 14: Magnetic force direction on a wire Abbott [2861541]
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a) A wire is placed vertically with current flowing upward in a uniform magnetic field that faces north. Which direction will
the wire feel a force?
south
up
down
east
west
north
b) A wire is placed horizontally along the east-west direction in a uniform magnetic field. When current flows in the west
direction it is found that the wire can levitate. Which direction could the magnetic field point?
south
north
west
down
east
up
5.
Question Details
C 14: Two wires force direction Abbott [2861542]
Two long straight wires are placed next to each other horizontally along the north south direction.
a) If the current in the two wires flows in the same direction, what is the direction of the force on the wire to the
east.
east
down
up
west
north
south
b) If the current in the two wires flows in the opposite direction, what is the direction of the force on the wire to
the east.
south
up
north
west
down
east
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6.
Question Details
C 14: Force on charged particle Abbott [2861543]
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A particle moving north with a speed of 5200 m/s in a uniform magnetic field pointing upward with a strength of 0.32 T feels
a force of 340 N toward the east.
a) What is the magnitude of the charge on the particle?
0.204 C
b) Does the particle have a positive or negative charge?
negative
positive
c) If you were to continue to watch the motion of this particle from above it looking down on the particle, what
would its motion do?
move in a clockwise circle with increasing speed
move in a counterclockwise circle with increasing speed
move in a clockwise circle with constant speed
none of the above
move in a counterclockwise circle with constant speed
7.
Question Details
C 14: Magnetic force on a wire Abbott [2861544]
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A straight 12 cm wire carries a current of 8.4 A. The direction of the current is perpendicular to a uniform magnetic field with
a magnitude of 4.4 T. What is the magnitude of the magnetic force on wire?
4.44 N
8.
Question Details
C 14: Force/Length on two wires Abbott [2861545]
Two long parallel wires are placed a distance of 11 cm from each other. One wire carryies a current of 3.9 A and the other
carries a current of 8.8 A ,
a) What is the magnetic force per unit length exerted on the wire carrying 3.9 A?
6.24e-05 N/m
b) What is the magnetic force per unit length exerted on the wire carrying 8.8 A?
6.24e-05 N/m
c) If the distance between the two wires is tripled by what factor does the force per unit length change?
0.333
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9.
Question Details
C 14: Flux and Faraday's Law Abbott [2861546]
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A coil of wire with 150 turns is wrapped in a circular shape with a radius of 26 cm. The plane of the coil is perpendicular to a
magnetic field of magnitude 4.0 T.
(a) What is the cross sectional area of the coil in m2?
0.212 m2
(b) What is the magnetic flux through the coil?
127 T · m2
(c) In a time of 0.40 s the coil is rotated 90° so that the plane of the coil is parallel to the magnetic field? What is
the magnetic flux through the coil after the rotation?
0 T · m2
(d) What is the average value of the induced voltage during the time the coil is rotated?
319 V
10.
Question Details
C 14: Faraday's Law Abbott [2861547]
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A 50 turn coil of wire has an area of 0.53 m2. A uniform magnetic field of 0.60 T points in a direction that is perpendicular to
the plane of the wire. In a time of 0.68 s the field reverses direction and points the other way with a magnitude of 0.30 T.
What is the average value of the induced voltage during the time the magnetic field reversed direction?
35.1 V
11.
Question Details
C 14: Transformer Abbott [2861548]
A transformer has 20 turns of wire in its primary coil and 65 turns on its secondary coil.
(a) Is this a step-up or step-down transformer?
step-up
step-down
(b) If an alternating voltage with an effective voltage of 140 V is applied to the primary, what is the effective
voltage induced in the secondary?
455 V
(c) If 3.7 A of current is supplied to the primary coil, what is the current in the secondary coil?
1.14 A
(d) What is the power delivered to this transformer?
518 W
Assignment Details
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