The phenomenon in which eddy currents create an opposing magnetic field is known as:

The phenomenon where eddy currents generate an opposing magnetic field is referred to as self-induction. When an electric current flows through a conductor, a magnetic field is produced. If there are changes in the current, either in magnitude or direction, it leads to variations in the magnetic field. According to Faraday’s law of electromagnetic induction, this changing magnetic field can induce eddy currents in nearby conductors. These eddy currents create their own magnetic fields that oppose the original change in the magnetic field, which is a manifestation of Lenz's law.

Self-induction specifically relates to the intrinsic property of a circuit (like an inductor) to oppose changes in its own current flow due to the induced electromotive force (emf) resulting from its magnetic field changes. This opposition to changes in current can be understood as a form of feedback, where the system reacts to maintain equilibrium.

Understanding why self-induction occurs is crucial for numerous applications in electrical engineering, including the design of inductors, transformers, and other components where managing magnetic fields is necessary for proper operation.