Cutting a magnet in half yields two magnets, each with its own north and south pole. This apparent absence of an isolated magnetic pole, or “magnetic monopole,” has puzzled physicists for more than a century. It would seem perfectly natural for a magnetic monopole to exist; Maxwell’s equations would reflect complete symmetry between electricity and magnetism if particles with magnetic charge were observed. But the mystery remains: While every known particle is either electrically charged or neutral, none have been found to be magnetically charged.
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Source: Phys.org