Electromagnetism

Definition

Electromagnetism is a branch of physics involving electric and magnetic fields and their interactions. It encompasses phenomena such as the force between charges and the behavior of magnets.

5 Must Know Facts For Your Next Test

1. Electromagnetic fields are generated by electric currents and changing magnetic fields.
2. An electromagnet consists of a coil of wire, usually wrapped around an iron core, which produces a magnetic field when an electric current flows through it.
3. The strength of an electromagnet can be increased by increasing the number of coils or the current passing through them.
4. Ferromagnetic materials like iron, cobalt, and nickel can enhance the magnetic field created by an electromagnet.
5. Electromagnets are widely used in various applications including electric motors, transformers, and maglev trains.

Review Questions

• What components are necessary to create an electromagnet?
• How can you increase the strength of an electromagnet?
• Name three ferromagnetic materials that can enhance an electromagnet's magnetic field.

Related terms

Magnetic Field: A region around a magnetic material or moving electric charge within which the force of magnetism acts.

Electric Current: A flow of electric charge carried by moving electrons in a conductor.

Ferromagnetism: A phenomenon where certain materials like iron exhibit strong magnetic properties due to the alignment of their internal magnetic domains.