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The upper part of the magnet is labeled, N or North Pole. The lower part of the magnet is labeled, S or South Pole. The field lines for magnetic field H flow from the North Pole of the magnet, travel through the surrounding and enter the South Pole of the magnet. Inside the magnet, the field lines travel from the South Pole to the North Pole where they exit again. They travel in closed loops. These loops don't start or stop at any point, nor do they cross other loops. The lines are dense in the region between the north and South Pole.