I had a question about the cbm's, I got of a VCR, it was copper middle with a metal bracket that looked like graphite...but didn't mark paper. But when hit it shatters..what's this?
Ferrite. From Wiki:
Ferrite (iron), iron or iron alloys with a body centred cubic crystal structure.
Ferrite (
magnet) (e.g. Fe3O4 or BaFe12O19), ferrimagnetic ceramic materials used in magnetic applications.
Ferrite bead, components placed on the end of data cables to reduce interference.
Ferrite
core, a structure on which the windings of electric transformers and other wound components are formed.
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