12 Magnetism 2 - Electromagnets

A magnetic field is a force field created by

• gravity

• force

• magnets

Arrows are close together on a force field when the force is

• stronger

• weaker

• opposite

A compass needle shows us the magnetic field of

• the sun

• Earth

• the moon

• a magnet that is near by

What kind of magnet can be turned on and off?

• refridgerator magnet
• electromagnet
• magnetite
• iron

Surrounding every magnet is a __________  __________.

• magnetic field
• electrical current
• another magnet
• an enemy

What is most likely to happen when the switch is closed?

• A magnetic field should be produced
• The nail will rust
• The battery will explode
• The wire will catch on fire

What are the ends of a magnet called?

• East and west poles
• Left and Right ends
• North and South ends
• North and South poles

How do electromagnets differ from regular magnets? 

• A. They  can be turned off and on 
• B. Their polarity can be reversed
• C. Their strength can be changed
• D. All of the above

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.

Magnets on refrigerator cannot be turned off. Which type of magnets they belong?

• electromagnets

• battery

• permanent magnets

• copper wire