A student uses a magnet to place a picture on the refrigerator door. Which statement explains how the magnet is able to stick to the refrigerator without directly touching it?(1 point)

Question

Responses

Friction acts through the picture and allows the magnet to stick to the refrigerator.

The magnet’s magnetic field can act at a distance, and influence the metal of the door through the picture.
The magnet’s magnetic field can act at a distance, and influence the metal of the door through the picture.

The force of gravity between the refrigerator and the magnet is strong enough to cause the magnet to stick.
The force of gravity between the refrigerator and the magnet is strong enough to cause the magnet to stick.

The picture’s own magnetic field attracts both the magnet and the refrigerator.

Answer 1

The correct statement is:

The magnet’s magnetic field can act at a distance, and influence the metal of the door through the picture.

This explanation accurately describes how the magnet can stick to the refrigerator without direct contact, as magnetic fields can exert forces over a distance, even through other materials.

Answer 2

Natasha wants to create her own electromagnet that can pick up small pieces of metal like paper clips or iron fillings. Which list of materials would Natasha need to build her electromagnet?(1 point)
Responses

string, battery, iron nail
string, battery, iron nail

battery, iron nail, wire
battery, iron nail, wire

glass rod, wire, battery
glass rod, wire, battery

Rubberband, string, battery

Answer 3

The correct list of materials Natasha would need to build her electromagnet is:

battery, iron nail, wire

This combination is essential for creating an electromagnet: the wire allows electric current to flow, the battery provides the power, and the iron nail serves as the core that enhances the magnetic field.

Answer 4

Below is a picture of an electromagnet made by wrapping a wire around an iron nail and connecting it to a battery. The electromagnet can be turned off by disconnecting it from the battery. A teacher helps students perform 2 experiments to test the variables that affect the electromagnet’s magnetic strength.


Experiment 1

The students build an electromagnet using a 4.5 volt battery connected to an iron nail with coils wrapped around it. They change the number of coils around the nail and record how many paperclips the electromagnet can pick up each time. The results are shown in the table below.
number of coils number of paper clips attracted to the magnet
10 5
15 8
20 11
25 15

Experiment 2

In the second experiment, the students keep the same number of coils around the nail and records how many paperclips the electromagnet can pick up using different batteries.
battery voltage (V) number of paper clips attracted to the magnet
3.0 3
4.5 7
6.0 9
7.5 12

Which question can be answered based on the results of Experiment 2?

(1 point)
Responses

How is the strength of an electromagnet affected by the number of coils around the nail?
How is the strength of an electromagnet affected by the number of coils around the nail?

How does the voltage of an electromagnet change when the type of paper clips changes?
How does the voltage of an electromagnet change when the type of paper clips changes?

How is the voltage of an electromagnet affected by the number of coils wrapped around the nail?
How is the voltage of an electromagnet affected by the number of coils wrapped around the nail?

How is the strength of an electromagnet affected by the voltage of the battery?
How is the strength of an electromagnet affected by the voltage of the battery?
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Answer 5

The question that can be answered based on the results of Experiment 2 is:

How is the strength of an electromagnet affected by the voltage of the battery?

This question directly relates to the varying battery voltages tested in Experiment 2 and their corresponding effects on the number of paperclips attracted to the electromagnet.

Answer 6

A __________ converts mechanical electrical energy to electrical energy.(1 point)
Responses

Generator
Generator

Electric Motor
Electric Motor

Solar cell
Solar cell

Magnet

Answer 7

A Generator converts mechanical energy to electrical energy.

Answer 8

A student wraps copper wire around an iron nail. Then she connects the ends of the wire to a battery, making an electromagnet. She notices that if she wraps more coils of wire around the bolt, then her electromagnet can pick up more paper clips. What conclusion can she draw?(1 point)
Responses

More coils of wire increases the length of the nail
More coils of wire increases the length of the nail

More coils of wire increases the strength of the electromagnet
More coils of wire increases the strength of the electromagnet

More coils of wire increases the mass of the battery
More coils of wire increases the mass of the battery

More coils of wire increases the density of the copper wire

Answer 9

The correct conclusion the student can draw is:

More coils of wire increases the strength of the electromagnet.

This is because adding more coils of wire around the iron nail enhances the magnetic field and thus the strength of the electromagnet.

Answer 10

A student places a bar magnet at different distances from a paper clip as pictured. Her results are in the table below.
trial distance from paper clip (cm) attract paper clip?
1 5 yes
2 10 yes
3 15 yes
4 20 no
5 25 no
6 30 no

Which conclusion can the student make based on the evidence from her experiment?

(1 point)
Responses

As the distance between objects increases, magnetism also increases
As the distance between objects increases, magnetism also increases

A magnetic field is strongest away from the magnet’s poles
A magnetic field is strongest away from the magnet’s poles

Magnetism depends on an object’s material
Magnetism depends on an object’s material

Magnetic fields can be observed between objects that are not touching
Magnetic fields can be observed between objects that are not touching
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Answer 11

The conclusion the student can make based on the evidence from her experiment is:

Magnetic fields can be observed between objects that are not touching.

This conclusion is supported by the fact that the paper clip was attracted to the magnet even when they were not in direct contact, demonstrating the presence of a magnetic field. Additionally, the results show that the attraction decreases with increasing distance, indicating that magnetism can act at a distance.