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Monopole
A magnetic monopole is a hypothetical elementary particle that has only a north pole or a south pole.
Explanation
The maxwell equations describe how electric and magnetic fields are generated by charges, currents and changes of these fields. One of these equations says that magnetic charges do not exist
where
∇⋅ divergence B magnetic induction
This means that magnetic monopoles do not exist.
Additional information
According to the Dutch physicist Gerard 't Hooft, monopoles are conceivable.