Electromagnetism

Based on the magnetic domains in this picture, the material is:

• strongly magnetized

• slightly magnetized

• unmagnetized

To make this electromagnet stronger you could:

• use less wire

• have fewer wire coils around the nail

• have more wire coils around the nail

• use a plastic core

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).

Electric current flowing through a wire produces

• static electricity
• an open circuit
• a permanent magnet
• a magnetic field

When running a current through a wire, what do the blue lines represent?

• The wire spinning

• A magnetic field that was created

• Electrons leaving

• Electricity

Surrounding every moving electron is 

• (a) a magnetic field
• (b) an electric field
• (c) both of these
• (d) none of these

What conclusion can you draw from this graph?

• As current increases, magnetic strength decreases.

• As current increases, magnetic strength increases.

• As current decreases, magnetic strength increases.

• There is no relationship between current and magnetic strength.

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

How do you make an electromagnet?

• wrap a battery in wire and connect it to an iron nail.
• wrap a wire with another wire and connect it to an iron nail.
• wrap an iron nail in wire and connect it to a power source.
• wrap an iron nail in wire and connect it to another iron nail.

What would happen if I move a bar magnet in and out of a coil of copper wire?

• Electric current would disappear 
• The magnet would explode 
• Electric current will flow through the wire
• It would produce a gravitational field