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

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

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Electronic Principles
The rms value of a sine waveform is:

equal to 1.41 times the peak amplitude
the time required to complete one full cycle
equal to 0.707 times the peak amplitude
the number of cycles completed in one second
None of these

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Electronic Principles
The core of an electromagnet is said to be in saturation when:

frequent changes in the direction of current through the coil causes heating effects in the core material
an increase in current through the coil causes no further increase in the mmf
changing the polarity of the current in the coil changes the polarity of the magnetic field around the core
None of these
the core is permitted to move freely within the coil

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