What is the term used to describe the phenomenon where magnetic flux in one coil induces an EMF in a second coil?

The phenomenon where magnetic flux in one coil induces an electromotive force (EMF) in a second coil is known as mutual inductance. This occurs when the magnetic field created by the current flowing through the first coil links with the second coil, causing an induced EMF.

Mutual inductance is a fundamental principle used in many electrical components such as transformers and inductors. It's important to understand that mutual inductance depends on factors like the number of turns in each coil, the physical proximity of the coils, and the core material, among others. This interaction is crucial for the operation of devices that rely on transferring electrical energy between coils without direct electrical contact.

In contrast, the term self-inductance applies solely to the induced EMF generated in a single coil due to its own changing current, while electromotive force refers more generally to the voltage produced in a circuit. Magnetic flux represents the total magnetic field passing through a given area and does not directly refer to the coupling between two coils. Thus, mutual inductance is the precise term for what occurs in the scenario described.