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Magnetic core
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=== Ring or bead === {{Main article|Ferrite bead}} [[File:Two inductors (437342545).jpg|thumb|On the left, a non-adjustable [[ferrite (magnetic core)|ferrite]] rod with connection wires glued to the ends. On the right, a molded ferrite rod with holes, with a single wire threaded through the holes.]] [[Image:Ferrite bead no shell.jpg|thumb|right|A ferrite ring on a computer data cable.]] The ring is essentially identical in shape and performance to the toroid, except that inductors commonly pass only through the center of the core, without wrapping around the core multiple times. The ring core may also be composed of two separate C-shaped hemispheres secured together within a plastic shell, permitting it to be placed on finished cables with large connectors already installed, that would prevent threading the cable through the small inner diameter of a solid ring.
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