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7. Electric Field, Superposition, Continuous Charge Distribution See Figure 3. An arc of total static charge -Q (Q >0) covers the first quadrant. The radial distance from the arc to point P, at the origin, is R. A second arc of total static charge +4Q spans the entire second quadrant, and it is of radius 4R from point P. What are the magnitude and direction of the net electric field at point P? Give magnitude in terms of the given quantities Q, R, and , . Assume that the charge across each arc is uniformly distributed.