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Physics Electrostatics Level: High School

Two spherical shells have a common center . A +2 x 10^-6 C charge is spread uniformly over the inner shell , which has a radius of 0.1 m . A -5 x 10^-6 C charge is spread uniformly over the outer shell , which has a radius of 0.2 m . Find the magnitude and direction of the electric field at a distance (measured from the common center ) of :

a) 0.05 m

b) 0.15 m