So I'm trying to study for a programming assignment I have tomorrow, and I've set myself up in a quiet room of the house where I usually study. 
I can sort of hear a slight buzz and thought it might be the fridge but its too far away, and noticed it was coming from the macbook charger.

This MacBook was purchased maybe 3 months ago, not even that I think. Its the 2012 one, 13". Its quite loud when I put my ear to it and I've never noticed it doing that before. Can anyone else see if their charger does this?

I cant have this right now because its on 35% and I use this to take all my notes and stuff from uni too. No charger is the last thing I need, aside from a fail on this paper I suppose too. 

Thanks,
Sam