## Impedance

#### We have long been able to manufacture capacitors that approximate the equation (2), for the most part with suitable precision; but the manufacture of inductors that closely approximate the description in equation (1) has been plagued by numerous barriers, especially at low frequencies. As such it has been found advantageous for many applications to simulate inductors electronically. Simulation of impedances is also helpful for such purposes as realizing capacitors and/or inductors whose values are continuously variable.

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