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A semicircle of radius a is in the first and second quadrants,...
Introduction: What is the magnitude of the net electric field at the origin produced by this distribution of charge?
More Details: A semicircle of radius a is in the first and second quadrants, with
the center of curvature at the origin. Positive charge +Q is
distributed uniformly around the left half of the semicircle, and
negative charge -Q is distributed uniformly around the right half
of the semicircle