Answer
The correct answer is: (b) from south pole to north pole
Work Step by Step
Outside a bar magnet, the field lines come out from the north pole and loop around to the south pole. However, inside a bar magnet, the field lines go from the south pole to the north pole.
We can see that normally a magnetic field line forms a closed loop, going from the south pole to the north pole inside a magnet, and then looping around from the north pole to the south pole outside a magnet.
The correct answer is: (b) from south pole to north pole.
