AP Phyisics C E & M: Two Thin Concentric Spheres

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Homework Statement



Two thin, concentric, conducting spherical shells, insulated from each other, have radii of 0.10 m and 0.20 m, as shown above(Graphic Above). The inner shell is set at an electric potential of -100 V, and the outer shell is set at an electric potential of +100 V, with each potential defined relative to the conventional reference point. Let Qi and Qo represent the net charge on the inner and outer shells, respectively, and let r be the radial distance from the center of the shells. Express all algebraic answers in terms of Qi, Qo, r and fundamental constants, as appropriate.

Homework Equations



I am having trouble with part (e), the graph. I understand the basic shape of the graph but I am confused as to why the value of E at 0.10 m is -4000N/C.


Note: This is an old AP question from the 2012 AP Physics C E & M test.

Thank you for your help!!

The Attempt at a Solution



I can't show my attempt to graph..
 

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