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Two spherical shells have a common center. A -1.00 × 10-6 C charge is spread uniformly...

Two spherical shells have a common center. A -1.00 × 10-6 C charge is spread uniformly over the inner shell, which has a radius of 0.050 m. A +4.00 × 10-6 C charge is spread uniformly over the outer shell, which has a radius of 0.15 m. Find the magnitude and direction of the electric field at a distance (measured from the common center) of
(a) 0.20 m,(b) 0.10 m,c) 0.025 m.

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