Two spherical shells have a common center. A -2.8 10-6 C charge is spread uniformly over the inner shell, which has a radius of 0.050 m. A +5.5 10-6 C charge is spread uniformly over the outer shell, which has a radius of 0.15 m. Discover the magnitude and direction of the electric field at the following distances (gauged from the common center).
1) 0.20 m (magnitude and direction)
2) .1m (magnitude and direction)
3) 0.025 (magnitude and direction)