Why does my ipad make a strange noise when i run my hand over the back case when it's charging?
When my ipad is plugged in and charging, if you run your hand/finger/ear over the back case it makes a weird electrical humming noise. Only when the flesh is moving across the case though, not when just resting on the metal.
Is this something I should worry about or just normal?
iPad 2, iOS 6.1.2