Electromagnetism

The diagram shows a device made up of a battery, some wire, and an iron core. Which type of device is shown?

• An electromagnet.

• A capacitor.

• A resistor.

• An inductor.

Which objects would you combine to build an electromagnet?

• Copper wire, source of electric current, steel screw.

• Aluminum wire, battery, plastic rod.

• Copper wire, magnet, iron nail.

• Copper wire, source of electric current, rubber band.

What materials are typically used to make an electromagnet?

• Copper wire and a ferromagnetic core, such as iron.

• Aluminum wire and a non-magnetic core, such as plastic.

• Copper wire and a ceramic core.

• Steel wire and a glass core.

What is the relationship between electricity and magnetism?

• Electricity can create a magnetic field, and a changing magnetic field can induce an electric current.

• Electricity and magnetism are completely unrelated phenomena.

• Magnetism can only exist in the presence of electricity.

• Electricity can only flow in a magnetic field.

What is the role of a battery in an electromagnet?

• It provides the electric current needed to create the magnetic field.

• It stores the magnetic field for later use.

• It increases the strength of the magnetic field without current.

• It acts as a switch to turn the electromagnet on and off.

Atoms that have a positive charge will be attracted to atoms with a _______ charge.

• Positive

• Neutral

• Negative

• Variable

How can you increase the strength of an electromagnet?

• By increasing the number of coils of wire or the amount of electric current.

• By using a thicker wire only.

• By reducing the voltage of the power source.

• By placing the electromagnet in a vacuum.

What is the South pole of a magnet?

• The end of a magnet that is attracted to the Earth's South magnetic pole.

• The end of a magnet that repels the Earth's North magnetic pole.

• The end of a magnet that is always positive in charge.

• The end of a magnet that is attracted to the Earth's equator.

What is the North pole of a magnet?

• The end of a magnet that is attracted to the Earth's North magnetic pole.

• The end of a magnet that repels the Earth's North magnetic pole.

• The end of a magnet that is attracted to the South pole of another magnet.

• The center of a magnet where magnetic forces are neutral.

What happens to the strength of an electromagnet when the electric current increases?

• The strength of the electromagnet decreases.

• The strength of the electromagnet remains the same.

• The strength of the electromagnet increases.

• The strength of the electromagnet fluctuates.