Quiz: Magnetic and Electromagnetic Forces Act on Certain Objects

What happens when the unlike poles of two magnets are brought closer together?

• A. The attractive force between the magnets decreases.

• B. The attractive force between the magnets increases.

• C. The magnets repel each other.

• D. The magnets do not interact with each other.

Zoe, Daniel, and Noah are in a science class learning about magnetism. Their teacher asks, 'Which of these determines whether or not a material that you might find in your everyday life, like a spoon or a coin, is not magnetic?'

• A. the density of the material

• B. the weight of the material on Earth

• C. the random alignment of atoms in the material

• D. the number of elements that make up the material

What happens when you get a magnet in half?

• B. When a bar magnet is cut in half, each half has a north pole and a south pole.

• A. When a bar magnet is cut in half, each half only has one pole while the other has the other.

Zoe, Kai, and Priya are working on a science project where they have created an electromagnet by wrapping many turns of wire around an iron bar and causing a current to flow through the wire. They are curious to know, how would increasing the electrical current affect the results and strength of their electromagnet?

• A. It would make the magnetic field of the magnet weaker.

• B. It would make the magnetic field of the magnet stronger.

• C. It would decrease the flow of electricity in the iron bar.

• D. It would increase the flow of electricity in the iron bar.

How does an electric motor utilize the principle of electromagnetism?

• A. It converts mechanical energy into electrical energy by moving a coil in a magnetic field.

• B. It uses magnets to generate visible light.

• C. It converts electrical energy into mechanical energy by creating a rotating magnetic field.

• D. It uses magnets to detect the presence of electric currents in nature.

Describe the relationship between distance and magnetic force

Identify what materials are magnetic. What are they called?

Design an electromagnet and identify ways to improve the strength of its magnetic force.