Discussion
The ratio of displacement current to conduction current in a medium of conductivity \( \sigma \) and permittivity \( \epsilon \) at angular frequency \( \omega \) is
Answer: A
This dimensionless ratio, sometimes called the loss tangent's reciprocal, decides whether a medium behaves as a conductor or a dielectric at a given frequency. Copper is a conductor to well beyond optical frequencies; dry earth is a dielectric above a few megahertz.
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