Which property of electromagnetic fields opposes current changes in a circuit?

Inductance is the property of electromagnetic fields that opposes current changes in a circuit. When current flows through a conductor, it generates a magnetic field around it. If the current changes, the magnetic field also changes, which induces a voltage in the conductor in the opposite direction to the change in current, according to Lenz's Law. This phenomenon is essentially the basis of inductance.

Inductors store energy in the magnetic field created by the flowing current, and because of this opposing voltage, they resist rapid changes in current. This characteristic is crucial in many applications, including filters and oscillators, where stable current and voltage levels are necessary. Thus, inductance plays a vital role in controlling current flow, especially in AC circuits and systems where current is frequently changing.