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The declination diagram
The declination diagram
The declination diagram
The declination diagram
That's the "magnetic declination". Since the true north pole and the magnetic north pole are located at different points on the earth, the declination is a different angle in different places on earth.
A black hole can have an electric charge if it swallows electrically charged objects, but no objects that we know of have magnetic charge. Magnets always have both a north pole and a south pole; there is no evidence that one can exist alone. A lone north or south pole would be called a magnetic monopole, and would have magnetic charge. If we discovered a magnetic monopole and fed it to a black hole then the black hole would gain the magnetic charge.
Assuming the subject is magnetic declination the difference between the north pole and the true north pole this difference, is the magnetic declination, there is not information on what purpose it serves.
There can only be one Cartesian North.
magnetic north north pole =magnetic south
It is magnetic north (not geographical north), which is the north on a magnetic compass.
Magnetic North. Runway numbers and letters are determined from the approach direction. The runway number is the whole number nearest one-tenth the magnetic azimuth of the centerline of the runway, measured clockwise from the magnetic north. - Aeronautical Information Manual (AIM) 2-3-3 b.
displayed on a nautical chart that shows the amount and direction of the magnetic declination for a specific location. It is used by navigators to correct compass readings and determine true north.