Magnets Review 1

Do magnets need to be touching an object to apply a force to it?

• No

• Yes, always

• Only if the object is metal

• Only if the object is moving

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What type of metal can be pulled by a magnet without being connected to a source of electricity?

• iron

• aluminum

• copper

• gold

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When two magnets are attracting or repelling, how does the force on one magnet compare to the other?

• The strength of the forces are equal and in opposite directions

• The force on the larger magnet is greater

• The force on the smaller magnet is greater

• The forces are always in the same direction

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What is one thing you can do to change if magnets are attracting or repelling each other?

• Flip the magnet to change which poles are facing each other.

• Paint the magnets a different color.

• Heat the magnets in the sun.

• Wrap the magnets in paper.

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A coil of copper wire has a magnetic field by itself because:

• It is made of copper

• It is coiled

• It has electric current flowing through it

• It is a conductor

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Do magnets need a medium to push or pull on one another? How do you know?

• They do not, we know this because magnets work in a vacuum. The Earth also has a magnetic field that extends into outer space.

• Yes, magnets need air as a medium to interact with each other.

• Magnets only work when placed in water or another liquid medium.

• Magnets require a solid object between them to push or pull on one another.

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How do things like iron and compasses act in a magnetic field?

• Iron and compasses line up in specific ways depending on where they are in a magnetic field. They are attracted to (and in the case of compasses repelled by) the poles.

• Iron and compasses are completely unaffected by magnetic fields and do not move at all.

• Iron and compasses always move randomly in a magnetic field, with no pattern or alignment.

• Iron and compasses dissolve when placed in a magnetic field.

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Is a magnetic field the same in every location around a magnet? How do you know?

• No. We can tell this because test objects act differently in different locations around the magnet. The field is strongest at the end of the magnets.

• Yes. The magnetic field is always uniform around a magnet.

• Yes. The magnetic field is only present at the center of the magnet.

• No. The magnetic field is only present on one side of the magnet.

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What happens to the strength of the magnetic field as you move closer to or further away from the poles?

• As you move closer to the poles, the magnetic field gets stronger. As you move further away from the poles, the magnetic field gets weaker.

• As you move closer to the poles, the magnetic field gets weaker. As you move further away from the poles, the magnetic field gets stronger.

• The strength of the magnetic field remains the same regardless of your distance from the poles.

• The magnetic field disappears as you move closer to the poles.

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Does an electromagnet have a north and south pole like a permanent magnet?

• Yes it does, we can tell because the north side of compasses point to one side while the south side of compasses point to the other.

• No, electromagnets do not have poles like permanent magnets.

• Only permanent magnets have north and south poles, not electromagnets.

• Electromagnets have only a north pole, not a south pole.

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