Uses of Electromagnets
An electromagnet induces regions of permanent magnetism on a floppy disk coated with a ferromagnetic material. The information stored here is digital (a region is either magnetic or not); in other applications, it can be analog (with a varying strength), such as on audiotapes.
Source
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"OpenStax College, Ferromagnets and Electromagnets. February 1, 2013."
http://cnx.org/content/m42368/latest/Figure_23_02_06a.jpg
OpenStax CNX
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