Electronic Principles
A high-pass filter:

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

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Electronic Principles
In a pure inductor:

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

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