Two charged, concentric, thin spherical shells have radii of 10.0 and 15. The charge on the inner shell is 5.1 10- 6 C/m and that on the outer shell...

Two charged, concentric, thin spherical shells have radii of 10.0 and 15.0 cm. The charge on the inner shell is 5.1 10- 6 C/m and that on the outer shell is -9.0 10-6 C/m. Find the electric field for the following from the center of the shells