What does an inductor store in its magnetic field?

An inductor stores electrical energy in its magnetic field when current flows through it. This occurs because, as the current changes, the inductor resists that change by generating a magnetic field around itself. The energy is stored in this magnetic field, and when the current decreases, the inductor releases the energy back into the circuit. This property is fundamental to how inductors function in electrical circuits, enabling them to be used in various applications such as filters, transformers, and energy storage.

The other forms of energy mentioned, such as mechanical energy, heat energy, and kinetic energy, do not pertain to the function of an inductor. Mechanical energy concerns moving parts or forces acting on objects, heat energy typically relates to thermal processes, and kinetic energy is associated with the motion of objects. Therefore, the focus on electrical energy is essential to understanding the role of inductors in electrical systems.