What do we call the induced voltage that moves in the opposite direction as the applied voltage in an inductor?

The induced voltage that moves in the opposite direction to the applied voltage in an inductor is commonly referred to as counter electromotive force (EMF). This phenomenon occurs due to Lenz's Law, which states that the direction of induced EMF will always be such that it opposes the change in current that created it.

When the current through an inductor changes, the magnetic field around it also changes, producing an induced voltage that counters this change. This action helps to maintain the stability of the current flowing through the inductor. Counter EMF is an essential concept in understanding the behavior of inductors in circuits, especially during abrupt changes in current.

Other terms may describe aspects of this phenomenon, but "counter electromotive force" specifically emphasizes the opposing nature of this induced voltage relative to the applied voltage, aligning precisely with the principles of electromagnetic induction.