Electronic Principles
A low-pass filter:

passes higher-frequency signals and reduces lower-frequency signals
has no effect on ac signals
None of these
passes lower-frequency signals and reduces higher-frequency signals
reduces 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 attracted to the earth's south magnetic pole
that has its molecules arranged in a random pattern
that would be repelled by the south pole of another magnet
None of these
that would be attracted to the earth's north magnetic pole

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