Apple Usb charger 20W making electric buzzing noise after disconnecting from power source
Is it normal for the 20W Usb-C official Apple charger (EU version) to make an electric buzzing noise after dissolving it from a power source?
After charging my iPhone 13 with its cable from the box and an official Apple 20W Usb-C charger, the charger still makes that electric buzzing noise when I disconnect it from a power source (I am currently using an extension cord that has a safe switch which I turn it off every time I don’t use it to charge my phone; and yes the extension cord is new and it’s in good condition, also the Apple charger is new and works perfectly fine).
But I want to know if it’s normal for a new 20W Usb-C Apple charger to still make an electric buzzing noise (not loud, only hearing it if right next to ear) when not plugged into a power source? or after charged my iPhone or other device
iPhone 13, iOS 16