MacBook 12 inch vibrating while charging.
I have never noticed this before. After plugging in my computer, I lightly ran my fingers over the casing to remove some dust, and felt a strange vibrating sensation.
This vibration is only on the top of the case, not on the bottom.
It happens when I touch the outside of the monitor side of the case, when the computer is both open or closed.
If I have thin cover of cloth between my fingers and the aluminum I do not feel the vibration.
It is as if it is a haptic sensation.
MacBook, macOS 10.14