A small compass is midway between the poles of a horseshoe magnet. The north, east, south and west directions are marked around the compass. At first, the magnet's north pole is west of the compass and its south pole is east of the compass, so the north-seeking end points east. The magnet is lifted, turned through a quarter-turn clockwise as viewed from above, and lowered around the compass again. The compass remains in the same position. Ignore the Earth's magnetic field. Which change occurs?
The north-seeking end turns a quarter-turn clockwise and points south.
The north-seeking end reverses direction and comes to point west.
The north-seeking end does not turn and continues to point east.
The north-seeking end turns a quarter-turn anticlockwise and points north.