Magnetism/Electromagnetism

The picture is an example of an:

• Electric circuit
• Electromagnet
• Electric nail
• Electric power cell

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These magnetic domains are:

• 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

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.

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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).

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Electric current flowing through a wire produces

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

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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

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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 happens when an electric current flows through a wire?

• The wire begins to spin.

• Nothing happens.

• A field of gravity is created around the wire.

• A magnetic field is created around the wire.

What type of core is best for electromagnets?

• Steel

• Iron

• Plastic

• Copper

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