how was fixed as a north pole and south pole on the earth?
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They are not fixed but drift continuously, the charges convection at core/atenosphere interface has an almost steady path then the magnetic field produced is fairly stable but matter convection is what produces continental drifts and is due to hot and cold spots in athenosphere, if that convection is dragging charges along its path, the magnetic field is as stable as the hot/cold spots.
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