AnswersCrowley Credit Recovery Physics BUnit Test

Magnets and Magnetism Answers

10 verified answers
1
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Two bar magnets are labeled A and B. The ends of each magnet are numbered 1 or 2, but the poles are not labeled. When A1 is brought near B1, the bars repel.

A
A1 is the north pole of a magnet, and B1 is the south pole of a magnet.
B
A1 is the north pole of a magnet, and B1 is the north pole of a magnet.
C
A1 and B1 are opposite poles, but there is not enough information to tell which ones.
D
A1 and B1 are like poles, but there is not enough information to tell whether they are north poles or south poles.
2
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The north pole of a strong magnet is dragged down an iron nail from the top to the point 50 times.

A
The nail will not pick up any paper clips because its domains are not aligned.
B
The nail will not pick up any paper clips because its domains have been aligned.
C
The nail will pick up some paper clips because its domains are not aligned.
D
The nail will pick up some paper clips because its domains have been aligned.
3

Before beginning an experiment, Mrs. Wilson warns her science class not to drop the bar magnets on the floor.

A
The magnet might lose its magnetism.
B
The magnet might make a startling noise.
C
The magnet might become stuck to the floor.
D
The magnet might cause the floor to become magnetic.
4

fieldspolesdomainscurrents

A
fields
B
poles
C
domains
D
currents
5

The presence of which magnetic feature best explains why a magnet can act at a distance on other magnets or on objects containing certain metals?

A
fields
B
dipoles
C
domains
D
forces
6

Barton conducts an experiment using three metallic bars that might be magnets. The bars are labeled A, B, and C. The ends of each bar are numbered 1 or 2.He places the end of one bar close to an end of a second bar and records his results in the table shown.Based on the data, which prediction should he expect to occur?

Question illustration
A
A2 repels B1.
B
C2 attracts B2.
C
B1 repels C1.
D
A1 attracts C2.
7

The presence of which magnetic feature best explains why a magnet can act at a distance on other magnets or on objects containing certain metals?

A
fields
B
dipoles
C
domains
D
forces
8

A magnetically soft material is placed in a strong magnetic field.

A
It will become a permanent magnet because the domains will remain aligned.
B
It will become a temporary magnet because the domains will remain aligned.
C
It will become a permanent magnet because the domains will easily realign.
D
It will become a temporary magnet because the domains will easily realign.
9

Pairs of magnets are shown in the diagram.

Question illustration
A
W
B
X
C
Y
D
Z
10

Two bar magnets are labeled A and B. The ends of each magnet are numbered 1 or 2, but the poles are not labeled. When A1 is brought near B1, the bars repel.

A
A1 is the north pole of a magnet, and B1 is the south pole of a magnet.
B
A1 is the north pole of a magnet, and B1 is the north pole of a magnet.
C
A1 and B1 are opposite poles, but there is not enough information to tell which ones.
D
A1 and B1 are like poles, but there is not enough information to tell whether they are north poles or south poles.
11

An iron nail does not pick up paper clips as a magnet would.

A
It has no domains.
B
It has domains that are not aligned.
C
It has domains that are aligned along the nail’s length.
D
It has domains that are aligned across the nail’s width.
12

How does the north pole of a magnet respond to the poles of other magnets?

A
It attracts both north and south poles.
B
It repels both north and south poles.
C
It attracts the north pole and repels the south pole.
D
It attracts the south pole and repels the north pole.
13

The diagram shows two bar magnets. They are cut along the dashed line, and then the two marked ends are placed near each other.

Question illustration
A
The pieces will repel because the cut end of the top magnet is not a magnetic pole.
B
The pieces will attract because the cut end of the top magnet is not a magnetic pole.
C
The pieces will repel because the cut end of the top magnet is a south pole.
D
The pieces will attract because the cut end of the top magnet is a north pole.
14

Which actions most likely cause the domains within a material to lose their alignment and become more randomized? Check all that apply.

A
heating the material
B
rubbing the material against a magnet
C
passing electricity around the material
D
placing the material in a magnetic field of opposite polarity
E
placing the material near a strong magnet
F
hitting the material
15

Which is the best procedure to make a permanent magnet?

A
placing a magnetically hard material in a weak magnetic field
B
placing a magnetically hard material in a strong magnetic field
C
placing a magnetically soft material in a weak magnetic field
D
placing a magnetically soft material in a strong magnetic field
16

A magnetically soft material is placed in a strong magnetic field.

A
It will become a permanent magnet because the domains will remain aligned.
B
It will become a temporary magnet because the domains will remain aligned.
C
It will become a permanent magnet because the domains will easily realign.
D
It will become a temporary magnet because the domains will easily realign.
17

This diagram shows the magnetic field lines near the ends of two magnets. There is an error in the diagram.

Question illustration
A
changing the N to S
B
reversing the arrows on the left to point toward the N
C
changing the S to N
D
reversing the arrows on the right to point toward the S
18

A bar magnet is placed on a table so that the north pole faces right.

A
They are pointing down into the table.
B
They are pointing right to left.
C
They are pointing left to right.
D
They are pointing up out of the table.
19

Which actions most likely cause the domains in a ferromagnetic material to align? Check all that apply.

A
heating the material
B
rubbing the material against a magnet
C
passing electricity around the material
D
placing the material in a magnetic field of opposite polarity
E
placing the material near a strong magnet
F
hitting the material
20

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

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

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