USAP Science Practice Exam 2026 – The All-in-One Guide to Master Your Science Certification!

Magnetic field lines form continuous loops, leaving the north pole and entering the south pole. For a bar magnet, outside the magnet the lines go from north to south, and inside the magnet they continue from south back to north, completing the loop. So describing the pattern as exiting from the north end and looping back into the south end matches the overall path of the field: it starts at the north, travels around to the south, and returns inside toward the north. The idea that there’s no field around a magnet is incorrect, and reversing the outside direction would not reflect the actual field flow.