Impossible for capacitors to make noise. Please refain from posting misinformation.
Actually, capacitors can and do make noises. Depending on the technology of the capacitor, it can make a whining noise when charging or discharging.
Another source of a "whining" noise can come from a coil based inductor used on older or high powered circuitry, this was usually remedied by placing a drop of hot glue over the inductor to prevent the coils from vibrating over the magnet.
Chances are however, the capacitors inside of the charger are SoC caps, and those generally do not make any noise, therefore one can make the assumption that the whining is coming from the transformer, which, albiet normal in high powered operations, isn't normal for a device of this stature.
Moral: Electronic devices "whine" by nature, sometimes the frequency of the whining is too high or too low for us to hear it.
Moral2: for safety, replace the charger
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