Which relay component holds the armature in a deenergized position?

The spring is the component responsible for holding the armature in a deenergized position within a relay. In relay systems, when the relay is not energized, the spring applies a force to the armature, ensuring that it remains in a specific position—usually the "normally closed" position. This mechanical action is crucial for the proper operation of the relay, as it dictates the default state of the circuit that the relay controls.

In contrast, other components listed, such as a solenoid, are used to create a magnetic field that moves the armature when energized, while a diode serves the purpose of allowing current to flow in one direction only and is not involved in maintaining position. A capacitor is used for storing electrical energy, filtering, or smoothing out voltage fluctuations and does not have a role in physically holding the armature in place. Thus, the spring’s role in maintaining the armature's position when the relay is deenergized is critical for the reliable operation of the electrical system.