About: http://webisa.webdatacommons.org/451155307

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	In this case, a device such as a permanent magnet or an electromagnet of proper geometry may be used to rotate the field around a 90??? angle so that the field can again couple to the disk.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com