Electromagnetism

The process of creating a current in a circuit by changing a magnetic field

• A. electric generator
• B. electric motor
• C. electromagnetic induction
• D. magnet

What is created when a magnet moves through a coil of wire?

• A. an electromagnet
• B. a ferromagnet
• C. a solenoid
• D. an electric current

Which of the following are two effects of Earth’s magnetic field?

• A. compass points to geographic north, auroras seen at both poles  
• B. compass points to magnetic north, auroras seen at both poles
• C. compass points to geographic south, auroras seen at the equator
• D. compass points to geographic north, auroras seen at the equator

What kind of magnet can be turned on and off?

• refrigerator magnet
• electromagnet
• magnetite
• iron

What is true about electricity and magnetic fields?

• Electricity is needed to create any magnet.
• Electricity always creates a magnetic field.
• Electricity is stronger than a magnetic field.
• Electricity prevents magnetic fields from occurring.

Where is the force of attraction the strongest on a magnet?

• at the poles
• in the middle
• above the magnet
• below the magnet

What is the main purpose of Earths magnetosphere (magnetic field)?

• To protect Earth from radiation from solar winds.

• To help keep the Earth rotating.

• It creates gravity.

• So that we know what direction we are going when using a magnet.

Are the magnetic field lines in the picture correct?

• Yes, because they point from north to south.

• No, because they point from north to south (they're supposed to go the other way).

• Yes, because the North pole is on the left in all pictures.

• No, because the North pole is on the left in all pictures (it's supposed to be on the right).

Earth’s magnetic field results from movements in the ____.

• mantle
• outer core
• inner core
• crust

How are electromagnets different from magnets?

• magnets can be turned on/off
• you can turn an electromagnet on/off
• magnets are more powerful
• magnets have a North and South pole