Definition

1. Noun:
   • The branch of physics concerned with electromagnetic phenomena: "Electromagnetism" is the scientific study of the interactions between electric charges and magnetic fields, and how they generate forces and waves, including light.
   • Magnetism produced by an electric current: "Electromagnetism" also refers to the magnetic force or field that is created by the flow of an electric current.

Usage Examples

• Noun:
  • The principles of electromagnetism are fundamental to understanding how electric motors work.
  • The discovery of electromagnetism unified the studies of electricity and magnetism into a single theory.

Advanced Usage

• "Classical electromagnetism": The theory of electromagnetism as described by Maxwell's equations, which does not include quantum effects.

  • Classical electromagnetism successfully describes the behavior of radio waves and circuits.

• "Quantum electromagnetism": The quantum field theory describing the electromagnetic interaction, also known as Quantum Electrodynamics (QED).

  • Quantum electromagnetism explains the interaction between light and matter at the most fundamental level.

Variants and Related Words

• Electromagnetic (adj): Relating to or involving electromagnetism.

  • An electromagnetic field surrounds any moving electric charge.

• Electromagnet (n): A type of magnet in which the magnetic field is produced by an electric current.

  • The junkyard uses a powerful electromagnet to lift scrap metal.

Synonyms

• Electrodynamics: Often used interchangeably with electromagnetism, though it can more specifically refer to the study of the dynamics of electric and magnetic fields and their interactions with charged particles.

Related Phrases and Concepts

• "Electromagnetic force": One of the four fundamental forces of nature, responsible for interactions between charged particles.

  • The electromagnetic force holds atoms and molecules together.

• "Electromagnetic spectrum": The full range of frequencies of electromagnetic radiation, from radio waves to gamma rays.

  • Visible light is only a small part of the electromagnetic spectrum.

• "Electromagnetic induction": The process of generating an electric current by moving a conductor through a magnetic field or by changing a magnetic field.

  • Electromagnetic induction is the principle behind electric generators and transformers.

Noun

1. the branch of physics concerned with electromagnetic phenomena
2. magnetism produced by an electric current
   • electromagnetism was discovered when it was observed that a copper wire carrying an electric current can magnetize pieces of iron or steel near it