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bmxicle
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Homework Statement
There are two conducting spheres, one hollow outer sphere which originally had +60nC of charge on it, and a smaller inner sphere enclosed by the hollow outer sphere which contains +20nC of charge.
Homework Equations
INT(E.DA) = Qenclosed/epsilon0
The Attempt at a Solution
Well first off obviously the inner sphere has +20nC of charge on it and that can't change. For the outer sphere, if you place a spherical gaussian surface that runs through the middle of the outer sphere the net Qenclosed must be zero as the Electric field is zero everywhere inside a conductor. So by this there must be -20nC on the inside of the shell and 80nC on the outside of the shell.
Now here comes the part I'm confused by. Isn't there still only +60nC of net charge on the outer sphere? The answer I was given says there is +80nC charge on the outer sphere, but i don't understand how that can be the net charge on the outer sphere.