Electronic Principles
A low-pass filter:

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

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Electronic Principles
In a pure inductor:

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

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