Electronic Principles
A high-pass filter:

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

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Electronic Principles
The north pole of a magnet is the one:

that would be repelled by the south pole of another magnet
that would be attracted to the earth's north magnetic pole
that would be attracted to the earth's south magnetic pole
None of these
that has its molecules arranged in a random pattern

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