1 year, 12 months ago
What is the purpose of some USB cables having magnets around one end?
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M$1 Answer
The idea is that coiling the wire around anything (and even nothing, simply coiling it) increases resistance to high frequency signals. AC signals travel on the outside of a conductor. The higher the frequency, the shallower the depth into the conductor they go. By winding the cable into a coil, the proximity of one winding to another severely limits AC current flow (proximity effect), while allowing lower frequency or DC current to pass. Wrapping the coil around a magnet reinforces the DC currents, while further weakening the high frequency AC.
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