My iBook is magnetic

Please tell me this is normal. About 2 inchers below the little hole on the gray part on the right side sournding the screen is magnetic. It's only magnetic for 1/2 an inch but is is really weird.
Please help
thank you in advance!
ibook g4   Mac OS X (10.4.8)  
ibook g4   Mac OS X (10.4.7)  

Hi John,
I think you'll find that it's actually the microphone, which contains some small magnets
The reed switch is in the screen module, but the actual magnet that activates it is part of the "top case", just above the battery bay.

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