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4. A thin sphere shown below has a radius of "a" meters and total charge of "Q" Coulombs. All the charge is equally distributed on the surface of the sphere, with no charge being inside, that is the volume charge density is zero. It is surrounded by another thin sphere with radius "2a" that contains an equal and opposite net charge of -Q, again equally distributed on the surface. Writing out Gauss' law, solve for the electric field (magnitude and direction) as a function of "" in the regions r<a, a<r<2a, and r>2a. Be sure to draw the Gaussian surface used for the calculation in the three regions. Draw a graph of E as a function of "y" and include on the grap specific values for E at r=0 and at "p" just slightly more than a, and at "r" just slightly less than 2a and "r" slightly more than 2a. You can leave e, in the expressions. Q kane no change K-Q have change a ap za 22