Location on Nexus 10 of magnetic screen turn off sensor?

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http://forums.androidcentral.com – I'm having some Nexus 10 issues and I think it might partly be due to me not letting the unit power down completely before closing the lid on my Snugg cover which turns off the screen via a magnet. Rather than going through this irritation again, I think I'd rather just remove the offending magnet from the cover, but before I go do that, I'd like to know where the magnetic sensor is on the Nexus 10, if anyone knows. Also, it is possible somehow to tell the Nexus 10 to disregard any of it's magnetic sensor inputs for blanking the screen? I couldn't find it but then I'm pretty much a newbie o (HowTos)