Do both poles of a magnet attract a paperclip?
A magnet will attract iron, steel, cobalt and nickel. These are known as ferrous metals.
NOTE: Steel has iron in it
A magnet will not attract brass, copper, zinc or aluminium.
These four magnetic materials iron, steel, cobalt and nickel can become magnetic when they are in a magnetic field. This is a result of the magnetic field encouraging its electrons to align, forming north and south poles.
A paperclip is made of steel and so will be attracted to a magnet, but it also has low retainability for keeping its magnetism.
The paperclip is a magnetisable thing so when facing the south pole of a magnet the atoms of the paperclip re-align themselves and becomes a north south facing magnet.
Because paperclips can be magnetised either way around when you change the pole of the magnet the paperclip will re-align its atoms.
In both stages the paperclip swaps sign so the force remains attractive.
This is why both ends of a magnet can attract a paperclip.
Just as both ends of a horse shoe magnet can attract paperclips.