How is electromagnetic induction defined?

Electromagnetic induction is defined as the process where a changing magnetic field induces an electric current. This principle is foundational to many electrical devices and technologies. When a conductor, such as a wire, is exposed to a changing magnetic field, it experiences a change in magnetic flux, which generates an electromotive force (EMF) or voltage in the conductor. This phenomenon is a result of Faraday's law of electromagnetic induction, which describes how the rate of change of the magnetic field correlates with the induced voltage.

This is why this definition accurately captures the essence of electromagnetic induction; it focuses on the relationship between the changing magnetic field and the resulting electric current, which is central to how generators, transformers, and many other electrical devices operate. Understanding this process is crucial for comprehending how electrical energy can be effectively generated and manipulated using magnetic fields.