Electromagnets

What effect will the south pole of one magnet have on the south pole of another magnet?

• Repulsive
• Attractive
• Combative
• No effect

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.

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

In order for an electromagnet to be formed, an __________ current must pass through a coil of __________ wrapped around an ________ core.

• wire, iron, electric
• electric, wire, iron
• iron, electric, wire
• excited, hair, apple

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

The attraction or repulsion created by spinning electric charges is called -

• A. electric generator
• B. magnetic force
• C. solenoid
• D. electromagnet

Any material that attracts iron or materials containing iron is a(n) 

• A. electric generator
• B. solenoid
• C. magnet
• D. magnetic force

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