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

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

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

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
an increase in current through the coil causes no further increase in the mmf
frequent changes in the direction of current through the coil causes heating effects in the core material

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