Power Adaptor Noise (the white box)

I got my macbook about 2 months ago. Recently I noticed my power adaptor has some noise, sounds z~~~~~. The noise is not very loud, you can only hear it when the environment is very quiet or when you hold the white box next to your ear. So I wonder whether is it normal? Is any of you who use macbook has the same problem?

I just noticed this today, the room was very quiet, and I heard a slight buzzing, i hunted for a few minutes, and found the culprit: The little white box. I've had my MacBook since June, so I don't know what the issue could be. I just don't want it to blow up or anything.

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