Physics and Magnetism Quiz

Mia is building a diorama showing the parts of an atom. She wants to better understand the effects of electric forces. An atom is made up of particles called protons, neutrons, and electrons. Which of the following best describes each particle?

• Protons are negative, neutrons are neutral, and electrons are positive.

• Protons are neutral, neutrons are positive, and electrons are negative.

• Protons are positive, neutrons are neutral, and electrons are negative.

• Protons are neutral, neutrons are negative, and electrons are positive.

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Oliver builds a circuit connecting a light bulb to a battery with wires, leaving a gap in one of the wires. He places several objects across the gap to close the loop. He wants to see which objects allow electricity to flow and turn on the light bulb. Why do some materials allow electricity to flow through while others do not?

• Electricity will flow if the atoms in the material are bound tightly to each other.

• Electricity will flow if the atoms in the material are bound loosely to each other.

• Electricity will flow if the electrons are bound tightly to their atoms in the material.

• Electricity will flow if the electrons are bound loosely to their atoms in the material.

Potential energy is the stored energy a system has to do an action, such as when you lift a book over your head right before you drop it. Potential energy also exists between charged particles. Which of the following is true about the potential energy between charged particles? Choose the two that apply.

• Potential energy increases as like charges get closer.

• Potential energy decreases as like charges get closer together.

• Potential energy increases as any charges move closer together.

• Potential energy decreases as opposite charges get closer.

• Potential energy remains the same between like charges as they move apart.

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Suki was investigating magnetism with two bar magnets. She finds that her magnets stick to some surfaces like the refrigerator door, the sink, and the window frame. The magnets did not stick to the window glass, the door, or the wall. What types of material attract a magnet?

• materials containing any type of metal

• materials that are shiny

• materials that contain iron

• materials that contain another magnet

Suki was investigating magnetism with two bar magnets. She finds that her magnets stick to some surfaces like the refrigerator door, the sink, and the window frame. The magnets did not stick to the window glass, the door, or the wall. Next, she decides to investigate their magnetic force. What tests could she perform to determine which magnet has a stronger magnetic force? Choose the two that apply.

• Put both magnets on a refrigerator door, and test which requires more force to pull it off the door.

• Put them next to each other, and test how much force is required to separate the two magnets.

• Pour iron filings onto both magnets while they are close together and see which magnet collects the largest pile of filings.

• Pour iron filings onto both magnets while they are apart and see which filings arrange into lines that are closer together.

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Naji was using his computer to model the strength of the magnetic field around a bar magnet. He knows that certain parts of the magnetic field are stronger than others. Where are the strongest and weakest parts of the magnetic field shown in the diagram?

• strongest: A, weakest: B

• strongest: A, weakest: D

• strongest: C, weakest: A

• strongest: C, weakest: B

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Justin was creating a chart comparing the potential energy between charged particles and the potential energy of magnets. Which of the following is true?

• The potential energy between both like charges and like poles increases as they move closer together.

• The potential energy increases between like charges and decreases between like poles as they move closer together.

• The potential energy between both like charges and like poles decreases as they move closer together.

• The potential energy decreases between like charges and increases between like poles as they move closer together.

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Awhina is constructing an electromagnet to demonstrate at the upcoming science fair. She is using wire, a nail, and a battery. How would this electromagnet work?

• The wire creates a loop between the nail and the battery, turning the nail into a magnet when current flows.

• The wire loops the nail to the battery so that the current can flow directly into the nail, creating a magnet.

• The wire loops around the nail, which becomes magnetic when the current flows from the battery through the wires.

• The wire loops around the nail and the battery, turning the entire system into a magnet.

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Awhina is constructing an electromagnet to demonstrate at the upcoming science fair. She is using wire, a nail, and a battery. She is using identical materials to create three different electromagnets of varying strength. How can the same materials be used to create a stronger electromagnet?

• Add more wire in between the battery and the nail so that more current can flow.

• Place less wire in between the battery and the nail so that more current gets to the nail.

• Add more loops of wire around the nail to increase the magnetic field.

• Wrap fewer loops of wire around the nail to increase the magnetic field.

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Kira is creating a list of the possible ways that the strength of an electromagnet can be altered. Which of the following should Kira NOT add to her list?

• adding an insulator to the electromagnet

• creating more wire loops

• changing the current in the wire

• spacing out the existing wire loops

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