Final answer:
The third Maxwell's equation, Faraday's law of induction, states that changes in magnetic fields induce electromotive forces, which create currents that oppose the original change.
Step-by-step explanation:
Described as Faraday's law of induction, the third Maxwell's equation is a fundamental principle within the overarching theory of electromagnetism. This law states that a changing magnetic field within a closed loop produces an electromotive force (emf), which in turn induces an electric field. The induced emf generated by such changes to the magnetic field creates a current with a direction that, as per Lenz's law, opposes the change in the magnetic field that produced it. Maxwell's third equation is known as Faraday's law of induction, which states that a changing magnetic field induces an electromotive force (emf) and an electric field. The direction of the emf opposes the change. This equation also includes Lenz's law, which states that the induced current in a circuit creates a magnetic field that opposes the change in the magnetic field. Faraday's law of induction is fundamental to understanding electromagnetic induction and the generation of electric currents.