About: http://webisa.webdatacommons.org/50880821

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	The magnetic field can be generated by the use of Helmholtz coils (as shown in FIG. 9 a), the use of a permanent magnet, or other suitable means.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com