12. What is the magnitude of the net electric field at the origin produced by this distribution of charge? Express your answer in terms of variables Q, a, and constant k. A semicircle of radius a is in the first and second quadrants, withthe center of curvature at the origin. Positive charge +Q isdistributed uniformly around the left half of the semicircle, andnegative charge -Q is distributed uniformly around the right halfof the semicircle in the following figure.(Figure 1) y+Q

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