Discussion
In which region does a crystal appear inductive?
Answer: D
Between the two resonances the series branch is net inductive and has not yet been cancelled by the holder capacitance, so the crystal presents an inductive reactance - and a very rapidly varying one, which is what makes it so effective as the inductor in a Colpitts-like arrangement. Below the series resonance and above the parallel one it is capacitive. The narrow inductive window is where nearly every crystal oscillator operates, and it is only a few kilohertz wide at ten megahertz.
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