For example next post on high pass filtering the sound of a mic in analog domain with a electromagnetic wave filter. Just a coil in series with a resistor and how electrons dance differently according to what are the L (inductance), R (Resistance) values.
The impedance of an (R,L) filter is frequency dependant. In fact the impedance is the vector (R,ωL) where ω, (ωμέγα) is angular velocity. ω is equal to 2 times π times f (frequency).
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