Default Question about GS3 Adapter

hello everyone, I have bought a GS3. when i charge my phone with the original charger, it makes a continuous humming noise! I sought help from the warranty and sadly they just said that it is not covered under the warranty.
charging with this stock charger does NOT produce excessive heat or delay more than normal time to fully charge the battery. my questions are:
1. is using of this chargers hazardous? (it is the stock charger, but make noise.)
2. using Galaxy Note 2 stock charger (which the output is 2 ampere in comparison with one ampere of the stock GS3 adapter) instead of original one will be harmful for my device?
thank you in advance for your replies.