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Energy Transformations — Unit test Answers

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1
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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
2
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Which statement describes the magnetic field inside a bar magnet?

A
It points from north to south.
B
It points from south to north.
C
It forms loops inside the magnet.
D
There is no field within the magnet.
3

A wire runs left to right and carries a current in the direction shown.

Question illustration
A
left
B
right
C
into the screen
D
out of the screen
4

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.
5

A point charge of 5.0 × 10–7 C moves to the right at 2.6 × 105 m/s in a magnetic field that is directed into the screen and has a field strength of 1.8 × 10–2 T.

A
0 N
B
2.3 × 10–3 N
C
23 N
D
2.3 × 1011 N
6

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
7

A point charge of 5.7 µC moves at 4.5 × 105 m/s in a magnetic field that has a field strength of 3.2 mT, as shown in the diagram.

Question illustration
A
6.6 × 10–3 N
B
4.9 × 10–3 N
C
4.9 × 103 N
D
6.6 × 103 N
8

A current in a wire increases from 2 A to 6 A. How will the magnetic field 0.01 m from the wire change?

A
It increases to four times its original value.
B
It increases to three times its original value.
C
It decreases to one-fourth its original value.
D
It decreases to one-third its original value.
9

The magnetic field 0.02 m from a wire is 0.1 T. What is the magnitude of the magnetic field 0.01 m from the same wire?

A
0.01 T
B
0.05 T
C
0.1 T
D
0.2 T
11

When using the right-hand rule to determine the direction of the magnetic field around a current-carrying straight wire, which part of the right hand points in the direction of the magnetic field?

A
palm
B
fingers
C
back
D
thumb
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

When using the right-hand rule to determine the direction of the magnetic force on a charge, which part of the hand points in the direction that the charge is moving?

A
palm
B
fingers
C
back
D
thumb
14

The diagram shows a negative charge moving in a magnetic field.

Question illustration
A
right
B
left
C
into the screen
D
out of the screen
15

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
16

[BLANK]

A
fingers
B
palm
C
back
D
thumb
17

Steel objects can become temporary magnets because they are mainly composed of which element?

A
carbon
B
iron
C
nickel
D
cobalt
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

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.
20

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.
21

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.

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