Magnets & Magnetism

What will happen when these magnets are brought close together?

• They will attract each other.
• They will repel each other.
• Both magnets will turn to the left
• Both magnets will turn to the right

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

The strongest part of a magnet is...

• the bars.
• the force field.
• the poles. 
• the middle.

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.

A type of magnet that has temporary magnetic effect when electric current flows through it.

This refer to

• Electric

• Electronic

• Electrostatic

• Electromagnet

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

You can make an electromagnet stronger by...

• increasing the current through the wire
• make the iron core bigger
• increase the number of loops around the core
• All of these