Stroking a piece of iron with a permanent magnet will line up the domains and magnetize it. Exam III Study Guide 18. Exam III Study Guide 19. You have four complete magnets, each one having a north and a south pole. One magnet has a south pole, one has a north pole, and two pieces are unmagnetized metal.
Nothing happens because it is impossible to break a magnet in half, much less into four pieces.
Exam III Study Guide 20. You are making a simple galvanometer to use as an ammeter. You can select either a thin or thick wire to make the coil. The lower resistance means a more accurate reading of the current. The higher resistance means more voltage for a given current.