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A sphere of radius a is filled with positive charge with uniform density p. Then a smaller sphere of radius a/2 is carved out, as shown in the figure, and left empty. What are the direction and magnitude of the electric field at B? Choose the direction of the electric field at B by picking the correct arrow from the diagram below. Then upload your work for solving for the magnitude of the electric field at B in the last question on this assignment for full credit. j zero magnitude O arrow a