- It doesn't have to be a MacBook exactly, other switched power supply powered metal case devices are good enough, but MacBook is the most common.
- It must be AC powered; the effect disappears when unplugged.
- Your other hand (which doesn't slide on the surface) must not touch the surface; the effect disappears when touching the surface with the other hand.
- You must move your finger; the effect disappears when you stop.
- The same effect can be felt by sliding on someone else who touches such a device.
- It's definitely not a potential difference.
- I suppose it's mechanical resonance, but can't explain.
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You are assuming other people feel these effects. I never have. – StephenG - Help Ukraine Nov 03 '23 at 23:49
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I'm sure other people feel this effect as I asked them. Have you ever tried? – sergio Nov 04 '23 at 01:15
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1Are you using a grounded power cord? – John Doty Nov 04 '23 at 01:25
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1I confirm the phenomenon exists. I have experienced it, and I am curious about the nature of it. The phenomenon is rare, indicating it requires a special combination of circumstances. Another example of someone reporting the phenomenon: a forum thread with the title: 'that hard to describe vibration when you rub hour hand over something electrical' To whoever proposed to close the question: I recommend keeping this question open. – Cleonis Nov 04 '23 at 02:34
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1Earlier question about the same phenomenon, posted in January 2011: 'Why does my wife's skin buzz when she's using her laptop?' Also: links to reports of the phenomenon on other fora in the comment section of this question: 'experiencing vibration when in contact with my desk computer and a rubbing a friend's arm. – Cleonis Nov 04 '23 at 02:53