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I wonder if it would be possible to build a USB-C charger where the tip is connected to the rest of the cord with magnets. I don't see why we would need to give up the disconnect-when-tripping-on-the-cord just because the final connector now becomes more solidly connected to the laptop?

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That depends on how magnetic the body is. Unless you mean a magnetic breakaway cable, but that would mean a dongle that would stick out all the time.

I think both could be marketable if this gets big in a generation or two.

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