Magnetism

What makes an electromagnet stronger?

• greater number of loops

• smaller number of loops

• decreasing the current

• decreasing the voltage

A magnet will pick up a nail, but not a penny because the nail

• has rust on it.

• is lighter than the penny.

• has a sharp point.

• contains iron.

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This is a picture of a simple electromagnet. How can the electromagnet be made stronger?

• Add more coils of wire to the nail.

• Use a smaller battery.

• Reverse the poles of the magnet.

• Remove all the coils and the nail.

The lines on this image are called...

• magnetic field lines

• iron fillings

• graphite lines

• none of these

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How is Earth's magnetic field similar to that of a magnet?

• It is hundreds of miles long

• It has north and south poles

• It is made in Earth's core

• It is shaped like a horseshoe

As the distance between two magnets increases (they get farther apart), the force between them:

• Increases

• Decreases

• Stays the Same

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Which of these is attracted to a magnet?

• iron nail

• copper penny

• piece of paper

• notebook

Magnets have a north and a south ___________

• shape

• color

• pole

• region

Magnetism is a type of ____________

• force

• book

• plant

• animal

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Once a paperclip touches a magnet and becomes a magnet itself, does a paperclip STAY that way? Or does it stop being a magnet?

• stay that way forever

• stop being a magnet

• stay that way for a short time