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In the above figure, what is the net electric potential at the origin due to the circular arc of charge $$Q_1=+7.21 \ pC$$ and the two particles of charges $$Q_2=4.00Q_1$$ and $$Q_3=-2.00Q_1$$? The arc's center of curvature is at the origin and its radius is $$R=2.00 \ m$$; the angle indicated is $$\theta=20.0^\circ$$.
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