About: http://webisa.webdatacommons.org/253911898

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	So it is not a fixed property of space, the magnetic field is a property of moving charges, different for each observer depending on the velocity of each observer.
http://www.w3.org/ns/prov#wasQuotedFrom	physicsforums.com