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**1. The problem statement, all variables and given/known data**

Two spherical shells have a common center. A -1.37 x 10

^{-6}C charge is spread uniformly over the inner shell, which has a radius of 0.0422 m. A +5.86 x 10

^{-6}C charge is spread uniformly over the outer shell, which has a radius of 1.60 m. Find the magnitude of the electric field at a distance (measured from the common center) of (a) 0.200 m (b) 0.100 m, and (c) 0.025 m.

**2. Relevant equations**

Honestly I'm not sure how to set this equation up.

I have calculated the Electric Field of each sphere. the smaller is 6.92*10

^{6}and the larger is 2.06*10

^{4}

I also calculated the Electric Flux each. The smaller being 6.54*10

^{4}and the larger being 6.63*10

^{5}.

Now i'm not quite sure if I have to add the two spheres together, or what to do since the inside sphere is negatively charged.

**1. The problem statement, all variables and given/known data**

**2. Relevant equations**

**3. The attempt at a solution**