Alphabetical
polarity
[noun]
The directionality of a magnetic field, which consists of a north and south pole of equal and opposite strength. Lines of magnetic force emanate from the north pole and terminate at the south pole. When the earth's magnetic north pole corresponds with the geographic north pole (as it does now), the polarity of the magnetic field is normal; when the magnetic north pole corresponds with the geographic south pole, the polarity of the field is reversed.
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