Magnetic Field on metal surfaces of MacBook Air when charging?

I've just bought my MacBook Air and when I have it charging for a while and then I run my hand over the metal surfaces (next to the trackpad or on the outer casing) I can feel a slight resistance which feels like a magnetic field. It builds up quicker when the battery is fully charged but still connected to the mains. When you run your fingers over the casing you take away the charge and so it isn't noticable immediately afterwards until it's built up again. But when you take the charge away from the casing it gives you a headache - so it can't be good for you? Has anyone else noticed this?

While some people are more sensetive to electromagnetic fields than others, I doubt it's something to be too concerned over.
It couldn't hurt to have a Genius at a nearby Apple store check it out, though.

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