Pairs - although monopoles have long been speculated about!

Monopoles are hypothetical particles that have only one magnetic pole, either a north pole or a south pole, as opposed to the dual nature of traditional magnets with both poles. They have not been observed in nature, but their existence is predicted by certain theories in physics. If discovered, monopoles could have significant implications for understanding fundamental forces in the universe.

Maxwell's second equation (Gauss's law for magnetism) states that magnetic monopoles do not exist since magnetic field lines always form closed loops, indicating that there is no source or sink of magnetic field. This means that magnetic field lines never start or end at a single point, and instead always form complete loops, leading to the conclusion that magnetic monopoles do not exist.

Magnetism is the result of moving electrical charges - and such movement will always result in a dipole.On the other hand, it has indeed been considered, by some modern theories, that there might be so-called "magnetic monopoles" - particles with only a north (or south) magnetic "charge" but no such monopoles have been observed so far. Perhaps the monopoles - should they exist - are too massive to be created in particle accelerators, for example.

All magnetisim is due to moving charges. The best way to think of why all magnets have two poles is to think of a coil of wire with a current in it. This will create a magnet very much like a bar magnet. In the coil, one end is the North pole and the other end is the South pole. Now you can see that the coil must have two poles because it must have two ends. Cut the coil in half and it still has two ends. Cut the coil down to one loop and it still has two ends. Even in a bar magnet the magnetism is due to the orbiting electrons in the material. One side of the orbit is one pole and the other side is the other pole and there is no way to have an orbit without two sides. Now if magnetisim had magnetic charges ,like electricity does, then you could have magnetic monopoles but no one has ever found a magnetic charge.