Final answer:
In the simulation, the tail of the arrow representing the direction of the magnetic field would be black, and the head of the arrow would be white.
Step-by-step explanation:
In the simulation, if you were to draw arrows representing the direction of the magnetic field, the tail of the arrow would be black and the head of the arrow would be white. This representation is based on Figure 20.9, where the black lines represent the magnetic field lines of a bar magnet, and the field lines point in the direction that the north pole of a small compass would point.