Electromagnetism and Building an Electromagnet

What is the main difference between a permanent magnet and an electromagnet?

• Permanent magnets require electricity to function.

• Electromagnets are always magnetic.

• Electromagnets can be turned on and off with electricity.

• Permanent magnets can be turned on and off with electricity.

Which of the following is NOT needed to build an electromagnet?

• A large nail

• Electrical tape

• Copper wire

• A magnet

Why is it important to leave some metal exposed at the end of the nail when wrapping the wire?

• To allow the metal to become magnetized.

• To ensure the nail can be used as a handle.

• To prevent the wire from slipping off.

• To make the electromagnet lighter.

What is the purpose of removing the plastic coating from the ends of the wires?

• To make the wires look better.

• To allow electricity to flow through the wires.

• To prevent the wires from breaking.

• To make the wires longer.

What should you do after using the electromagnet to magnetize objects?

• Remove the battery.

• Wrap more wire around it.

• Turn it off to conserve energy.

• Leave it on to save power.