Question

Which diagram best illustrates the magnetic field of a bar magnet?

A bar magnet with a north and south pole. Field line vectors are leaving the north pole and curl around to the south pole.
A bar magnet with a north and south pole. Field line vectors are leaving the south pole and curl around to the north pole.
A bar magnet with a north and south pole. Field line vectors are leaving the north pole and curl around to the south pole.
A bar magnet with a north and south pole. Field line vectors are leaving the south pole and curl around to the north pole.

Answer 1

The first (and third) description is correct: magnetic field lines emerge from the north pole and curve around to enter the south pole (closing through the magnet from south back to north).