What is a Variable inductor?

An inductor (coil) is one of electronic components. It is made by winding copper wire around an iron core. Induced electromotive force is generated when current is passed through the copper wire inside the inductor and the amount of current is changed. This is called inductance and is expressed in units of henries (H). A variable inductor is a device whose inductance can be changed by placing a small driver or adjustment rod on the top of the device and rotating the knob to slide the iron core inside it up and down.

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