Figure Q30.31 shows two permanent magnets, each having a hole through its center. Note that the upper

Question:

Figure Q30.31 shows two permanent magnets, each having a hole through its center. Note that the upper magnet is levitated above the lower one.
(a) How does this occur?
(b) What purpose does the pencil serve?
(c) What can you say about the poles of the magnets from this observation?
(d) If the upper magnet were inverted, what do you suppose would happen?

Figure Q30.31 shows two permanent magnets, each having a hole