Magnets & Electromagnets

Passing a current through a piece of wire causes a magnetic field to form around the wire.

• True
• False

Magnetic fields are created by moving _______.

• Atoms
• Protons
• Electric Charges
• Metals

In order for an object to become magnetic, its electrons must ______.

• Move in random order
• Line up or face opposite directions
• Go to opposite sides of the object
• Line up or face the same direction

The magnetic field of an electromagnet ______.

• Can be turned on and off.
• Is permanent.
• Lasts for only one hour.
• Lasts for one day.

Electricity is the flow of ____________.

• Protons
• Neutrons
• Electrons

When a bar magnet is broken in half, what is the result?

• Two north poles
• Two south poles
• Two north poles and two south poles
• The bar loses its magnetic properties

A magnet's magnetic field exists ________.

• Only on the north pole
• Only on the south pole
• On both poles
• Around the entire magnet

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

Which of the following is shown in the picture?

• Electromagnet
• Electric generator
• Electric motor
• Transformer