# Book N Ch 2 Chapter Test

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• 1.

### Group of atoms with aligned magnetic poles.

• A.

Motor

• B.

Electromagnet

• C.

Magnetic domain

• D.

Aurora

C. Magnetic domain
Explanation
A magnetic domain refers to a group of atoms that have aligned magnetic poles. In a magnetic material, such as iron or nickel, the atoms are arranged in small regions called magnetic domains. Within each domain, the atoms' magnetic moments are aligned in the same direction, creating a strong magnetic field. However, the overall material may not exhibit a strong magnetic field because the domains are randomly oriented. When an external magnetic field is applied, the domains align, resulting in a stronger overall magnetic effect.

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• 2.

### Device that converts electric energy into kinetic energy

• A.

Transformer

• B.

Motor

• C.

Generator

• D.

Electromagnet

B. Motor
Explanation
A motor is a device that converts electric energy into kinetic energy. It does this by using the principle of electromagnetism, where an electric current passing through a coil of wire creates a magnetic field. This magnetic field interacts with permanent magnets or other magnetic fields to generate a rotational force, which results in the movement of the motor's shaft and the conversion of electrical energy into mechanical energy. Therefore, a motor is the correct answer as it directly converts electric energy into kinetic energy.

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• 3.

### Current-carrying wire wrapped around an iron core

• A.

Aurora

• B.

Electromagnet

• C.

Motor

• D.

Alternating

B. Electromagnet
Explanation
An electromagnet is created when a current-carrying wire is wrapped around an iron core. The iron core enhances the magnetic field generated by the current, making the electromagnet stronger. This is because iron is a ferromagnetic material, which means it can easily be magnetized. Electromagnets are used in various devices such as motors, generators, and speakers, where the magnetic field produced by the electromagnet interacts with other magnetic fields to create motion or sound.

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• 4.

### LIght emitted in a display sometimes called the "Northern Lights"

• A.

Magnetic field

• B.

Generator

• C.

Magnetic domain

• D.

Aurora

D. Aurora
Explanation
The light emitted in a display sometimes called the "Northern Lights" is known as an aurora. This natural phenomenon occurs when charged particles from the sun collide with atoms in the Earth's atmosphere, causing them to emit light. The interaction between the Earth's magnetic field and these charged particles is responsible for the formation of the auroras, which are typically seen in the polar regions.

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• 5.

### Uses magnetism to produce electric power

• A.

Generator

• B.

Motor

• C.

Transformer

• D.

Magnetic domain

A. Generator
Explanation
A generator is a device that uses magnetism to produce electric power. It works by converting mechanical energy into electrical energy through the process of electromagnetic induction. This is achieved by rotating a coil of wire within a magnetic field, which creates an electric current in the wire. The generated current can then be used to power various electrical devices.

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• 6.

### Changes the voltage of an alternating current

• A.

Electromagnet

• B.

Generator

• C.

Tranformer

• D.

Magnetosphere

C. Tranformer
Explanation
A transformer is a device that changes the voltage of an alternating current. It consists of two coils, a primary coil and a secondary coil, which are wrapped around a magnetic core. When an alternating current passes through the primary coil, it creates a changing magnetic field in the core. This changing magnetic field induces a voltage in the secondary coil, which can be either higher or lower than the voltage in the primary coil, depending on the number of turns in each coil. Therefore, a transformer is used to step up or step down the voltage of an alternating current, making it an appropriate answer for the given question.

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• 7.

### Area around a magnet where magnetic forces act

• A.

Magnetic field

• B.

Electromagnet

• C.

Magnetosphere

• D.

Magnetic domain

A. Magnetic field
Explanation
The area around a magnet where magnetic forces act is called the magnetic field. A magnetic field is a region in space where a magnetic force can be detected. It is created by the presence of a magnet or a moving electric charge. The strength and direction of the magnetic field determine the behavior of magnetic materials and the interaction between magnets. The concept of a magnetic field helps explain various phenomena, such as the attraction or repulsion between magnets and the behavior of compass needles.

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• 8.

### Current that changes direction

• A.

Direct current

• B.

Alternating current

• C.

Motor

• D.

Electromagnet

B. Alternating current
Explanation
The correct answer is alternating current. Alternating current is a type of electric current that constantly changes direction, typically in a sinusoidal waveform. This is in contrast to direct current, which flows in only one direction. Alternating current is commonly used to transmit electricity over long distances and is the type of current used in most household electrical outlets. Motors and electromagnets can also be powered by alternating current.

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• 9.

### Earth's magnetic field

• A.

Magnetosphere

• B.

Electrosphere

• C.

Hydrosphere

• D.

Aurora

A. Magnetosphere
Explanation
The correct answer is magnetosphere. The Earth's magnetic field extends into space and creates a region called the magnetosphere. It acts as a shield, protecting the planet from harmful solar winds and charged particles. The magnetosphere is formed due to the interaction between the Earth's magnetic field and the solar wind. It plays a crucial role in preventing these particles from directly reaching the Earth's surface and also causes phenomena like auroras in the polar regions.

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• 10.

### Moving a magnet in and out of a coil of wire produces a(n)

• A.

Increase in voltage

• B.

Stronger magnetic filed

• C.

Electric current

• D.

Electromagnet

C. Electric current
Explanation
When a magnet is moved in and out of a coil of wire, it induces a change in magnetic field within the coil. This change in magnetic field creates an electric current to flow through the wire according to Faraday's law of electromagnetic induction. Therefore, the correct answer is electric current.

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• 11.

### If both coils of a transformer have the same number of turns, the output voltage will be ___ compared to the input voltage.

• A.

Stepped up

• B.

Stepped down

• C.

The same

• D.

Cancelled

C. The same
Explanation
If both coils of a transformer have the same number of turns, the output voltage will be the same as the input voltage. This is because the voltage in a transformer is determined by the ratio of the number of turns in the primary coil to the number of turns in the secondary coil. When both coils have the same number of turns, this ratio is 1:1, resulting in an output voltage that is equal to the input voltage.

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• 12.

### The aurora are produced when Earth's magnetic field interacts with ___

• A.

The Van Allen belt

• B.

Electrically charged particles

• C.

The Sun's magnetic field

• D.

The biosphere

B. Electrically charged particles
Explanation
The aurora are produced when Earth's magnetic field interacts with electrically charged particles. These charged particles, such as electrons and protons, are emitted by the Sun during solar flares and coronal mass ejections. As these particles approach Earth, they are deflected by the planet's magnetic field and directed towards the polar regions. When they collide with atoms and molecules in the Earth's atmosphere, they emit light, creating the beautiful phenomenon known as the aurora borealis (in the Northern Hemisphere) and aurora australis (in the Southern Hemisphere).

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• 13.

### The Sun emits ___ that stream through the solar system.

• A.

Earth's magnetosphere

• B.

Auroras

• C.

A biosphere

• D.

charged particles

D. charged particles
Explanation
The Sun emits charged particles that stream through the solar system. These charged particles, also known as solar wind, are a continuous flow of high-energy particles released by the Sun's corona. As the solar wind interacts with Earth's magnetosphere, it can cause various phenomena such as the formation of auroras. Therefore, the statement accurately describes the emission of charged particles from the Sun and their effects on the solar system.

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• 14.

### The core of an electromagnets is usually made of

• A.

Glass

• B.

Copper

• C.

Iron

• D.

Aluminum

C. Iron
Explanation
An electromagnet is a type of magnet that is created by passing an electric current through a coil of wire. The core of an electromagnet is usually made of iron because iron is a ferromagnetic material, meaning it can easily be magnetized. When the electric current passes through the coil, it creates a magnetic field in the core, making it a strong magnet. Iron is chosen as the core material because it has a high magnetic permeability, which allows the magnetic field to be efficiently generated.

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• 15.

### A magnetic field exists around a wire whenever

• A.

The wire is coiled

• B.

The wire is wrapped around an iron nail

• C.

A magnet attracts a wire

• D.

Current flows through a wire

D. Current flows through a wire
Explanation
A magnetic field exists around a wire whenever current flows through it. This is because when an electric current passes through a wire, it creates a circular magnetic field around the wire according to Ampere's law. The strength of the magnetic field depends on the magnitude of the current and decreases with distance from the wire. Therefore, the presence of current in a wire is necessary for the existence of a magnetic field around it.

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• 16.

### The domains in an unmagnetized material that can be magnetized are aligned

• A.

In all directions

• B.

North to south

• C.

In only one direction

• D.

In opposite directions

A. In all directions
Explanation
In an unmagnetized material, the domains, which are small regions with aligned magnetic moments, are randomly oriented. When an external magnetic field is applied, these domains can be aligned in any direction, depending on the orientation of the field. Therefore, the domains in an unmagnetized material can be magnetized in all directions.

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• 17.

### Magnetic force is exerted through

• A.

The north poles only

• B.

The south poles only

• C.

A magnetic field

• D.

An aurora

C. A magnetic field
Explanation
The correct answer is a magnetic field. Magnetic force is exerted through a magnetic field, which is a region in space where magnetic forces can be detected. It is not limited to the north or south poles of a magnet, but rather encompasses the entire space around the magnet. The magnetic field is responsible for the attraction or repulsion between magnets and the movement of charged particles. Additionally, it is also involved in the formation of phenomena such as auroras.

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• 18.

### An electric current that flows back and forth in a circuit is a(n)

• A.

Direct current

• B.

Alternating current

• C.

Induced current

• D.

Transformed current

B. Alternating current
Explanation
An electric current that flows back and forth in a circuit is known as an alternating current. This type of current periodically changes direction, reversing its flow multiple times per second. Alternating current is commonly used for the transmission and distribution of electricity because it can be easily converted to different voltages and is more efficient for long-distance transmission. In contrast, direct current flows continuously in one direction and is typically used for smaller electronic devices or in specific applications where a constant flow of current is required. Induced current and transformed current are not accurate terms to describe this type of current.

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• 19.

### A moving electric charge creates

• A.

A magnetic field

• B.

• C.

Neutrons

• D.

Static electricity

A. A magnetic field
Explanation
When an electric charge is in motion, it produces a magnetic field. This is known as electromagnetic induction and is a fundamental principle in physics. The magnetic field created by the moving electric charge can interact with other charges or magnetic materials, causing various effects such as attraction or repulsion. Therefore, the correct answer is that a moving electric charge creates a magnetic field.

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• 20.

### In a bar magnet, the lines of force are strongest

• A.

In the center

• B.

At the poles

• C.

On the sides

B. At the poles
Explanation
In a bar magnet, the lines of force are strongest at the poles. This is because the poles of a magnet have the highest concentration of magnetic field lines. The magnetic field lines emerge from one pole, curve around the magnet, and re-enter at the opposite pole. The closer the field lines are to each other, the stronger the magnetic field. Therefore, the lines of force are strongest at the poles where the field lines are most concentrated.

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• 21.

### Place a checkmark on all of the ways an electromagnet can be increased in strength.

• A.

Increase the current

• B.

Decrease the number of coild

• C.

Increase the number of coils

• D.

Use a larger battery

• E.

Use a smaller battery

• F.

Use a larger core

A. Increase the current
C. Increase the number of coils
D. Use a larger battery
F. Use a larger core
Explanation
Increasing the current flowing through an electromagnet increases the strength of the magnetic field produced. Increasing the number of coils in the electromagnet also increases the number of turns through which the current flows, resulting in a stronger magnetic field. Using a larger battery provides a higher voltage, which in turn increases the current and therefore the strength of the electromagnet. Using a larger core increases the magnetic flux density, leading to a stronger magnetic field.

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• 22.

### Electricity flowing through a coil of wire produces

• A.

A magnetic field

• B.

An alternating current

• C.

A compass

A. A magnetic field
Explanation
When electricity flows through a coil of wire, it creates a magnetic field around the coil. This is due to the interaction between the electric current and the electrons in the wire. The magnetic field produced can be used for various purposes, such as in electromagnets or electric motors. Therefore, the correct answer is that electricity flowing through a coil of wire produces a magnetic field.

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• 23.

### A doorbell works because it contains a(n)

• A.

Electric motor

• B.

Electromagnet

• C.

Transformer