The wireless charger has sound because it uses electromagnetic induction technology, which produces a buzzing sound when an electromagnetic field is formed between the charger and the device. This is caused by the interaction of electric currents and magnetic fields in electromagnetic fields.
In the process of wireless charging, the frequency of the electromagnetic field is very high, so the sound generated is also high frequency.
In addition, the circuit and components of the charger will also produce some sound, so when using the wireless charger, you will hear some buzzing.
Wireless charger inside the induction coil and magnet power will resonate! There's a slight noise!