To find:
The effect on the voltage when the south side of the magnet is in rather than the north.
Step-by-step explanation:
When the south side is moved in instead of the north pole of the magnet, the polarity of the bar magnet is reversed. This makes the induced field change its direction. Thus the induced emf is also reversed.
Thus the voltage is reversed when the south side in moved in rather than the north.
Final answer:
The direction of the voltage is changed by 180° when the south side is moved in rather than the north side.