# Magnets

## Quiz by Laura Valentine

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11 questions
• Q1
The attractive force between two magnets increases. Which statement explains why this would happen?
The like poles of the magnets are pointed at each other and move closer together.
The unlike poles of the magnets are pointed at each other and move farther apart.
The unlike poles of the magnets are pointed at each other and move closer together.
The like poles of the magnets are pointed at each other and move farther apart
45s
• Q2
Kim has two bar magnets. First, she places them beside one another, as shown in Picture A. Then, she moves one of the bar magnets so they are placed as shown in Picture B. How did the magnetic force change?
The bars go from attracting each other to repelling each other.
The bars go from attracting each other to the second bar rotating.
The bars go from repelling each other to rotating
The bars go from repelling each other to attracting each other.
60s
• Q3
Which of these determines whether or not a material is magnetic?
the alignment of atoms in the material
the weight of the material on Earth
the density of the material
the number of elements that make up the material
60s
• Q4
Candice claims that all magnets have two magnetic poles. Which of these observations would best support her claim?
The north pole of a compass needle is attracted to the south pole of a bar magnet.
The strength of the magnetic force from a bar magnet decreases as the magnet is pulled away from another object.
When a bar magnet is cut in half, each half has a north pole and a south pole.
Iron is attracted to a magnet but not to other pieces of iron.
45s
• Q5
Angela tries to pick up a copper penny using a bar magnet, but the penny does not move. Next, she tries to pick up an iron nail using the bar magnet, and the nail lifts up toward the magnet. Which of the following best describes a ferromagnetic material like iron?
Ferromagnetic materials conduct electricity easily.
Ferromagnetic materials have magnetic domains that align with a magnetic field.
Ferromagnetic materials are nonmetals that produce magnetic forces.
Ferromagnetic materials produce their own magnetic force.
45s
• Q6
A magician wants to use magnets to create a new illusion for her show. She plans to hide strong magnets in her shoes and inside a special rug on the stage. When she tests the illusion, she finds that her shoes stick to the rug. What will happen if she flips the poles of the magnets in each of her shoes?
Her shoes will stick to each other instead of to the rug.
Her shoes will float above the rug.
Her shoes will still be stuck to the rug.
Her shoes will no longer be affected by the rug.
45s
• Q7
Why can some objects be magnetized by rubbing one pole of an existing magnet in one direction along the object?
The motion of the existing magnet against the object scrambles, or unaligns, the magnetic domains of the object.
The motion of the existing magnet against the object wears away the object’s surface, exposing the naturally occurring magnets underneath.
The motion of the existing magnet against the object aligns the magnetic domains of the object.
The motion of the existing magnet against the object generates an electric current that transforms the object into an electromagnet.
45s
• Q8
A student finds three unmarked bar magnets in a lab. She wants to know how strong each of the magnets is. She also has a set of paper clips. Explain how she could use the paper clips to determine the strength of each magnet.
Put the magnet on the paperclip
Put the paperclips together
Measure the amount of distance needed to pull the paper clips
Time how long it takes the paperclips to stick together
45s
• Q9
Ajit has a bar magnet, a copper rod, an iron rod, and a steel rod. First, he moves the magnet toward the middle of the copper rod. Next, he moves the magnet toward the middle of the iron rod. Finally, he moves the magnet toward the middle of the steel rod. In each step of his investigation, he writes down his observations. What is he trying to discover?
What is metal?
What materials are magnetic?
Why magnets like metal?
How strong magnets are?
45s
• Q10
What would this look like if it became magnetized?
Nothing would change
The arrows would go away
All the arrows would face the same direction
The arrows would alternate directions, but have a pattern
60s
• Q11
Why is this material not magnetic?
The atoms are too far away
The forces cancel out
The poles are repelling
There are no magnets
60s

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