Macbook Air M1 electric vibration on the back when charging and plugged in to external monitor

[greentint]

Hey everyone.
Recently got a MBA M1 and noticed something weird. When the laptop is charging and when I plug in my external monitor to my Mac (using a Display Port to USB-C adapter) , if i run a finger on the back of the laptop lid, I feel a slight electric vibration. The charger is the original 30 Watt charger that comes in the box. Coincidentally, I tried charging my Macbook in another room with a Dell USB-C charger, and in this case did not get that vibration. Overall I am curious if this can damage the Macbook, as I have to use the external monitor for my work.
I appreciate any help and suggestions.
Thank you all very much.

 

[doolar]

It's because the power brick lacks the earth prong on the connector. Back in the good old days all Macbooks came with the extension cord, and that's got the ground connector - the power bricks have the connector too.

Now this won't help in your specific case, but if you use a charger with a ground connection to a grounded wall socket, you won't be grounding the computer with your hands - and the tingling will stop.

Here's the cable I mean if you've not seen it before. I use my old trusty one from an older Macbook, and I think you can buy them from Apple directly:

 

[greentint]

It's because the power brick lacks the earth prong on the connector. Back in the good old days all Macbooks came with the extension cord, and that's got the ground connector - the power bricks have the connector too.

Now this won't help in your specific case, but if you use a charger with a ground connection to a grounded wall socket, you won't be grounding the computer with your hands - and the tingling will stop.

Here's the cable I mean if you've not seen it before. I use my old trusty one from an older Macbook, and I think you can buy them from Apple directly:

ok that explains that, but why is it happening while my monitor is connected though ?

 

[greentint]

I am wondering if the vibration caused by the monitor is due to a bad usb-c dongle ?