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" ... Electromagnetic fields as they would be generated by positive and negative electric charges, both at... [+] rest and in motion (top), as well as those that would theoretically be created by magnetic monopoles (bottom), were they to exist. ... "
" ... Gravitational monopoles are easy: it’s just a mass. Electric monopoles are easy, too: any fundamental particle with a charge, like an electron or a quark, will do. But magnetic monopoles? As far as we can tell, they don’t exist. Our universe would be amazingly different, though, if they did. Think about, for a moment, how electricity and magnetism are related. ... "