Electronic Principles
A low-pass filter:

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

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Electronic Principles
Doubling the operating frequency of a purely inductive circuit:

cuts the current through the inductors one-half
doubles the amount of current through the inductors
has no effect on the current through the inductors
increases the current, but by an amount that can be determined only by doing a complete analysis of the circuit
None of these

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