Magnets

In a homemade electromagnet, what must you do to increase the number of paper clips their electromagnet picks up?

• make the wire longer

• remove the nail from the center of the wire

• increase the number of loops of wire around the nail

• spread the loops of wire apart on the nail so they do not touch

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NGSS.MS-PS2-3

Donna is attempting to make an electromagnet to pick up old nails in and around her driveway. Which of these materials would be best to use for the core in order to make the strongest electromagnet to pick up the most nails?

• iron nail

• water

• wooden stake

• plastic spoon

Tags

NGSS.MS-PS2-3

You rub a balloon on your head and it becomes negatively charged. The balloon will be MOST attracted to ...

• a piece of metal.

• positively charged hair.

• the neutrally charged wall.

• another negatively charged balloon.

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NGSS.MS-PS2-3

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Which set of magnets correctly illustrates the attraction of unlike poles?

• A

• B

• C

• D

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NGSS.MS-PS2-3

This force is a pull between all objects. It is the force that gives us weight here on Earth. And, if we throw a rock off of a cliff, it is the force that causes the rock to fall to Earth. What is this force?

• Gravity

• friction

• resistance

• magnetism

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Which electromagnet would have the most strength?

• An electromagnet with 5 coils.

• An electromagnet with 10 coils.

• An electromagnet with 15 coils.

• An electromagnet with 20 coils.

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NGSS.MS-PS2-3

Which change would result in a stronger electromagnet?

• Reducing the number of batteries

• Increasing the voltage of the battery

• Substituting another metal for the iron core

• Decreasing the number of coils around the iron core.

Tags

NGSS.MS-PS2-3

Which set of magnets correctly illustrates the repulsion of like poles?

• A

• B

• C

• D

Tags

NGSS.MS-PS2-3

Braddy connected the loose wire to the battery and created an electromagnet. He picked up 45 thumb tacks with his electromagnet, though his goal was to pick up 50 thumb tacks. What could Braddy do to increase the strength of his electromagnet and pick up more thumbtacks?

• Use fewer coils of wire.

• Use a screw instead of a nail.

• Use two batteries instead of one.

• Replace the nail with a piece of steel.

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NGSS.MS-PS2-3

How is an electromagnet different from a bar magnet?

• Only a bar magnet has a magnetic field.

• Only an electromagnet attracts materials made of iron.

• An electromagnet is temporary and is magnetic when a current flows through a wire wrapped around the core.

• A bar magnet is a temporary and is only magnetic when a current flows through a wire wrapped around the core.

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