Magnets and Electromagnets Milestone Review

What materials can be attracted to magnets?

• Copper, Zinc, and Aluminum

• Iron, Nickel, and Cobalt

• Gold, Silver, and Platinum

• Lead, Tin, and Brass

What is the difference between a magnet and an electromagnet?

• A magnet is temporary, while an electromagnet is permanent.

• A magnet requires electricity, while an electromagnet does not.

• A magnet is permanent, while an electromagnet requires electricity to generate a magnetic field.

• A magnet can only attract iron, while an electromagnet can attract any metal.

How can you make an electromagnet stronger?

• By using a thicker wire

• By adding more wire coils and/or batteries

• By reducing the voltage

• By using a shorter wire

What is the main material that makes up the Earth's core?

• Nickel

• Iron

• Copper

• Aluminum

What is magnetic repulsion?

• Magnetic repulsion occurs when two like poles of magnets (north-north or south-south) push away from each other.

• Magnetic repulsion is the attraction between opposite poles of magnets.

• Magnetic repulsion happens when a magnet is placed near a metal object.

• Magnetic repulsion is the force that pulls two unlike poles of magnets together.

What is a bar magnet?

• A circular piece of magnetized material with no poles.

• A rectangular piece of magnetized material that has a north and south pole.

• A type of magnet that can only attract iron.

• A small, handheld magnet used for crafts.

What happens when two magnets repel each other?

• They attract each other.

• They push apart.

• They stick together.

• They create heat.

Why does a compass needle point towards the north?

• It is attracted to the North Star.

• The compass needle lines up with the Earth's magnetic field.

• It follows the rotation of the Earth.

• It is influenced by the gravitational pull of the moon.

What is the Earth's magnetic field?

• A magnetic field generated by the sun.

• The magnetic field that extends from the Earth's interior out into space.

• A field that only exists during solar eclipses.

• A magnetic field created by human activities.

What is the role of electricity in an electromagnet?

• Electricity creates a magnetic field in an electromagnet when it flows through the wire coils.

• Electricity is used to power the electromagnet's physical structure.

• Electricity cools down the electromagnet to prevent overheating.

• Electricity is only needed to turn the electromagnet on and off.