Electronic Principles
A basic capacitor is composed of:

two coils separated by a conductor
two coils separated by a dielectric
two conductors separated by a dielectric
two dielectrics separated by a conductor
None of these

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Electronic Principles
A low-pass filter:

None of these
has no effect on ac signals
reduces the level of all frequencies by a significant amount
passes lower-frequency signals and reduces higher-frequency signals
passes higher-frequency signals and reduces lower-frequency signals

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