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

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

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Electronic Principles
A low-pass filter:

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

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