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

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

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Electronic Principles
A low-pass filter:

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

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