MacBooks "buzzing/pulsating" whilst charging.

[Alpha Centauri]

My 2009 MBP does this quite strongly. It‘s not a burst of static discharge, especially when ambient air is dry. This is a continuous buzzing when moving one’s hand across the case. My m2 MBP doesn’t do this at all.

So I’m a fan of Hannah Fry and her practical explanations of physics, and came across this brilliant take of what’s really going on when this happens. Pls take a look of the link before commenting:

 

[Alameda]

If you plug your Mac charger into the wall using a grounded, three-prong plug, then you don't get the buzz. Apple used to include this cable with Macs but they no longer do.