How do the two pieces of the broken magnet behave?
a) It results in two half magnets. The half of the north pole behaves like a pure north pole, the half of the south pole like a south pole.
b) Both pieces consist of a north pole and a south pole, so that each piece is a complete magnet.
c) A magnet always has a north and a south pole. When these are separated, the magnet is broken and loses its attraction.
d) The separation creates two new magnets, because the positive and negative charges of both pieces realign themselves.