Discussion
Why does a long cable behave as a capacitive load at moderate frequencies?
Answer: D
Well below the frequency where its length matters, a cable looks like a lumped capacitance of perhaps a hundred picofarads per metre, and that is what loads the stage. Its inductance and characteristic impedance become relevant only when the length approaches a wavelength, and dielectric loss is a second-order effect. Knowing which model applies at which frequency prevents both over-complicating a low-frequency problem and under-modelling a high-frequency one.
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