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Variable inductors are adjustable passive components that allow the inductance value to be changed manually or electronically. This adjustability is typically achieved by altering the position of a movable core within the coil. Variable inductors are commonly used in tuning circuits, oscillators, RF applications, and communication devices, where precise control of frequency or impedance is required. They enable real-time circuit adjustments, making them ideal for prototypes, calibration tasks, and frequency-sensitive applications. With their flexibility and functionality, variable inductors play a crucial role in fine-tuning and optimizing electronic performance.