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
that has its molecules arranged in a random pattern
None of these

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Electronic Principles
The period of a waveform is:

the time required for the voltage to rise from 10% to 90% of the peak amplitude
the number of cycles completed in one second
equal to 0.707 times the peak amplitude
None of these
the time required to complete one full cycle

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