Cylinder on USB cable

Hi,
I was looking at a USB cable and I noticed a black cylinder, about 2cm
diameter, just after the connector on each end of the lead. I was
wondering what this is?
Thanks
Reply to
Moikel
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It's a chunk of ferrite. aka ferrite ring.
You can Google search on that to find out why it's there and what it does.
Reply to
Palindr☻me

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