Electronic Principles
For a pure capacitor:

None of these
ac current is converted to dc voltage
ac current lags the voltage by 90 degree
ac current leads the voltage by 90 degree
ac current and voltage are exactly in phase

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Electronic Principles
A low-pass filter:

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

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