Magnetism Quiz

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

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.

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

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.

The magnetic field of Earth acts very similarly to a bar magnet. The magnetic field is created by molten iron within Earth’s core. Humans and animals rely on the magnetic field for navigation. Describe how the magnetic field is used for navigation, and explain how it protects life on Earth.