Electricity and Magnetism

What kind of magnet can be turned on and off?

• refridgerator magnet
• electromagnet
• magnetite
• iron

What happens when a wire is wound into a coil around an iron core in an electromagnet?

• the wire exolodes
• you get electricuted 
• the magnetic field becomes stronger
• the magnetic field becomes weaker

While electric current is flowing through a wire, what surrounds the wire?

• a magnetic field
• a glowing light
• neutrons
• protons

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 are three ways to make an electromagnet stronger?

• 1. add more coils of wire around the iron core
  2. add more electricity flowing through the wire
  3. wrap a thinner wire around the core
• 1. add less coils of wire around the iron core
  2. add more electricity flowing through the wire
  3. wrap a thinker wire around the core
• 1. add more coils of wire around the iron core
  2. add less electricity flowing through the wire
  3. wrap a thicker wire around the core
• 1. add more coils of wire around the iron core
  2. add more electricity flowing through the wire
  3. wrap a thicker wire around the core.

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.

Which of the following is NOT part of an electromagnet?

• Wire
• Iron
• Toothpick
• Power source

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

What is magnetism?

• Energy created by magnets
• A force created by magnets
• A contact force
• An invisible force that attracts electrically charged particles

What are the ends of a magnet called?

• East and west poles
• Left and Right ends
• North and South ends
• North and South poles