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Magnetism and Electromagnetism — Test Answers

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1
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What should Lionel observe during his investigation?

A
A large current forms, drops to zero, then remains at zero.
B
A large current forms, drops to zero, then a smaller current forms in the same direction.
C
A small current forms, drops to zero, then a larger current forms in the same direction.
D
A large current forms, drops to zero, then a smaller current forms in the opposite direction.
2
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As Keisha runs the generator, which best describes what should happen to the needle that measures electric current?

A
It will move to a large negative value and stay there.
B
It will move back and forth between a large positive and a large negative value.
C
It will move back and forth between 0 and a large positive value.
D
It will move to a large positive value and stay there.
3

What should Lionel observe during his investigation?

A
A small current forms, drops to zero, then a larger current forms in the same direction.
B
A large current forms, drops to zero, then remains at zero.
C
A large current forms, drops to zero, then a smaller current forms in the opposite direction.
D
A large current forms, drops to zero, then a smaller current forms in the same direction.
4

The wire is then connected to a battery so that a current flows down the wire. How will the compasses point once the current is flowing?

A
Image with description A long wire that is vertical and standing on a steel plate. There are 4 compasses surrounding it and all of the needles are pointing counterclockwise.
B
Image with description A long wire that is vertical and standing on a steel plate. There are 4 compasses surrounding it and all of the needles are pointing in the same direction, west.
C
Image with description A long wire that is vertical and standing on a steel plate. There are 4 compasses surrounding it and all of the needles are pointing clockwise.
D
Image with description A long wire that is vertical and standing on a steel plate. There are 4 compasses surrounding it and all of the needles are pointing in the same direction, east.
5

Which pair of magnets is aligned so they will repel each other?

A
X
B
Z
C
W
D
Y
6

Which is true of a step-down transformer but not a step-up transformer?

A
The core is made of iron and the coils are made of copper.
B
The primary winding has fewer coils than the secondary winding.
C
The core is made of copper and the coils are made of iron.
D
The primary winding has more coils than the secondary winding.
7

A magnetically soft material is placed in a strong magnetic field. What is the most likely outcome?

A
It will become a permanent magnet because the domains will remain aligned.
B
It will become a temporary magnet because the domains will easily realign.
C
It will become a temporary magnet because the domains will remain aligned.
D
It will become a permanent magnet because the domains will easily realign.
8

Which is the best procedure to make a permanent magnet?

A
placing a magnetically soft material in a weak magnetic field
B
placing a magnetically soft material in a strong magnetic field
C
placing a magnetically hard material in a strong magnetic field
D
placing a magnetically hard material in a weak magnetic field
9

Craig is modeling the discovery of electromagnetism. Which procedure should he use?

A
bringing a compass near a wire that has an electric current
B
moving a magnet into a coil of wire in a closed circuit
C
moving a magnet into a coil of wire in an open circuit
D
bringing a compass near a wire that has no electric current
10

Which device converts electrical energy into kinetic energy?

A
a step-down transformer
B
an electric generator
C
an electric motor
D
a step-up transformer
11

Which device converts electrical energy into kinetic energy?

A
a step-up transformer
B
a step-down transformer
C
an electric motor
D
an electric generator
12

Which describes Hans Oersted’s work with electricity and magnetism?

A
He discovered electromagnetic induction after seeing a compass needle deflected by a flowing electric current.
B
He discovered electromagnetic induction after seeing a changing magnetic field generate an electric current.
C
He discovered electromagnetism after seeing a changing magnetic field generate an electric current.
D
He discovered electromagnetism after seeing a compass needle deflected by a flowing electric current.
13

A current in a wire increases from 2 cap A to 6 cap A How will the magnetic field 0 point 0 1 m from the wire change?

A
It increases to three times its original value.
B
It decreases to one-third its original value.
C
It decreases to one-fourth its original value.
D
It increases to four times its original value.
14

A point charge of 6 point 8 mu cap c moves at 6 point 5 times 10 to the 4th power m/s at an angle of 15 degrees to a magnetic field that has a field strength of 1 point 4 cap t What is the magnitude of the magnetic force acting on the charge?

A
6 point 0 times 10 inverse cap n
B
1 point 6 times 10 inverse cap n
C
1 point 6 times 10 to the 5th power cap n
D
6 point 0 times 10 to the 5th power cap n
15

The magnetic field 0 point 0 2 m from a wire is 0 point 1 cap t What is the magnitude of the magnetic field 0 point 0 1 m from the same wire?

A
0 point 1 cap t
B
0 point 0 1 cap t
C
0 point 2 cap t
D
0 point 0 5 cap t
17

Which describes the magnetic field that forms when a wire carries an electric current?

A
It is in a line perpendicular to the wire.
B
It is in a line parallel with the wire.
C
It is in a cylinder across the wire.
D
It is in a cylinder around the wire.
18

While researching magnetic fields, Marisa finds several online sites that describe a fictitious north monopole that is a magnet with only a north pole. Although it does not exist, the north monopole is used to describe magnetic field lines. Which statement best describes how the monopole would be used to describe magnetic field lines?

A
The field lines around a magnet point from the south pole to the north pole to show the direction of the magnetic force on the monopole.
B
The field lines around a magnet point from the north pole to the south pole to show the direction of the magnetic force on the monopole.
C
The field lines around a magnet point from the north pole to the south pole to show the direction opposite to the magnetic force on the monopole.
D
The field lines around a magnet point from the south pole to the north pole to show the direction opposite to the magnetic force on the monopole.
19

Pedro uses a bar magnet to pick up a nail. He then touches the tip of the nail to some staples. Why do some of the staples stick to the nail?

A
The nail and the bar magnet are now both temporary magnets.
B
The nail and the bar magnet are now both permanent magnets.
C
The nail has become a permanent magnet, while the bar magnet has become a temporary magnet.
D
The nail has become a temporary magnet, while the bar magnet remains a permanent magnet.
20

What is the best conclusion that can be drawn?

A
A current does not flow in the wire.
B
A current flows down the wire.
C
A current flows, but its direction cannot be known.
D
A current flows up the wire.
21

Which functions belong in the cells marked X and Y?

A
X: Conducts current to the armature and reverses direction of current Y: Rotates as a result of changing magnetic forces
B
X: Allows current to flow into the commutator Y: Rotates as a result of changing magnetic forces
C
X: Rotates as a result of changing magnetic forces Y: Conducts current to the armature and reverses direction of current
D
X: Allows current to flow into the commutator Y: Conducts current to the armature and reverses direction of current

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