Answers25-26 TX-Physics B-CRLab: Electromagnetic Induction

Lab: Electromagnetic Induction — Unit test Answers

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1
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The diagram shows a nail before and after a procedure was done.

Question illustration
A
It was made to conduct electricity, which caused the domains to randomize and the nail to become nonmagnetic.
B
It was rubbed with a magnet, which caused the domains to line up and the nail to become magnetic.
C
It was struck repeatedly, which caused the domains to randomize and the nail to become nonmagnetic.
D
It was heated, which caused the domains to line up and the nail to become magnetic.
2
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What is the purpose of the metal core in an electromagnet?

A
It is magnetized and induces a current in the solenoid to decrease the magnetic field strength.
B
It is magnetized and induces a current in the solenoid to increase the magnetic field strength.
C
It is magnetized by the field of the solenoid and increases the magnetic field strength.
D
It is magnetized by the field of the solenoid and decreases the magnetic field strength.
3

electromagnetismelectromagnetic inductionelectromagnetic spectrumelectromagnetic force

A
electromagnetism
B
electromagnetic induction
C
electromagnetic spectrum
D
electromagnetic force
4

A charged particle moves at 2.5 × 104 m/s at an angle of 25° to a magnetic field that has a field strength of 8.1 × 10–2 T.

A
3.7 × 10–5 C
B
4.1 × 10–5 C
C
8.8 × 10–5 C
D
1.0 × 10–4 C
5

A point charge of 6.8 C moves at 6.5 × 104 m/s at an angle of 15° to a magnetic field that has a field strength of 1.4 T.

Question illustration
A
1.6 × 10–1 N
B
6.0 × 10–1 N
C
1.6 × 105 N
D
6.0 × 105 N
6

Trina makes a diagram to summarize how to use the right-hand rule to determine the direction of the magnetic force on each type of charge.

Question illustration
A
X: Thumb, for velocityY: Fingers, for magnetic fieldZ: Palm of hand, for force
B
X: Back of hand, for forceY: Thumb, for velocityZ: Palm of hand, for force
C
X: Palm of hand, for forceY: Thumb, for velocityZ: Fingers, for magnetic field
D
X: Palm of hand, for forceY: Fingers, for magnetic fieldZ: Back of hand, for force
7

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

A
The core is made of copper and the coils are made of iron.
B
The core is made of iron and the coils are made of copper.
C
The primary winding has fewer coils than the secondary winding.
D
The primary winding has more coils than the secondary winding.
8

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.

A
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.
B
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.
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 north pole to the south pole to show the direction of the magnetic force on the monopole.
9

A force of 1.5 × 102 N is exerted on a charge of 1.4 × 10–7 C that is traveling at an angle of 75° to a magnetic field.

A
8.2 × 102 T
B
8.5 × 102 T
C
3.2 × 103 T
D
6.4 × 1010 T
10

Trent builds a model electric motor. When he connects a battery to the motor, the motor spins through a half rotation and stops.

A
replacing the battery, because it is not providing current
B
installing new brushes, because they are not making a good connection
C
checking the commutator, because the current is not reversing
D
adding more wire coils in the armature, because the electromagnet is too weak
11

Gazala makes the device shown in the diagram and uses it to pick up four paper clips on the point of the nail.

Question illustration
A
reversing the battery
B
reversing the nail and using the nail’s head
C
wrapping the wire around the nail more times
D
unwrapping several loops of the wire from the nail
12

Yoon Ki investigates electromagnetic induction by moving a bar magnet into a coil of wire. His experimental setup is shown.

Question illustration
A
moving the magnet faster
B
using more loops of wire in the coil
C
using the south pole of the magnet
D
connecting the galvanometer to the coil
13

Which device converts kinetic energy into electrical energy?

A
an electric generator
B
an electric motor
C
a step-down transformer
D
a step-up transformer
14

Which change can make a generator stronger?

A
decreasing the size of the slip rings
B
increasing the size of the slip rings
C
decreasing the number of coils in the armature
D
increasing the number of coils in the armature
15

Lidia makes a graphic organizer to compare temporary magnets with permanent magnets.

Question illustration
A
X: Maintains magnetic properties in the presence of another magnetY: Is made from magnetically hard ferromagnetic material
B
X: Repels or attracts other magnetsY: Attracts iron objects
C
X: Maintains magnetic properties in the presence of another magnetY: Is made from magnetically soft ferromagnetic material
D
X: Attracts or repels iron objectsY: Attracts other magnets

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