Electronic Principles
A high-pass filter:

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

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Electronic Principles
When a series RLC circuit is operating at its resonant frequency:

the difference between inductive and capacitive reactance is equal to the resistance
inductive reactance is greater than the capacitive reactance
None of these
capacitive reactance is greater than the inductive reactance
inductive reactance is equal to the capacitive reactance

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