Macbook Pro feel like vibrating when charging

When I charge my battery and continue to work on my Macbook Pro, the part of the Macbook where you rest the heals of your hands when typing vibrates, it is very fine and feels like the casing is electrostatically charged. Anyone else get this/can explain this? Is this bad for my MBP late 2011?

Many have reported the same. But none said it was a problem.
If MBP has 7200 RPM HD, it may produce vibration.
http://support.apple.com/kb/TS2666
You can always take the computer to the Apple Store for evaluation.
Best.

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