Final answer:
The magnetic field around a bar magnet moves from the north pole to the south pole, with magnetic field lines visually representing this external flow direction.
Step-by-step explanation:
The magnetic field around a bar magnet is moving from the north pole to the south pole. This is observed externally as magnetic field lines surrounding the magnet. It's a basic property of magnets that these lines indicate the direction of the magnetic field, which is away from the north pole and towards the south pole of a magnet. If we consider the Earth as a giant magnet, it is interesting to note that its magnetic north pole is actually the south pole of a hypothetical bar magnet and vice versa.