In Figure three thin plastic rods form quarter-circles with a common center of curvature at the origin. The uniform charges on the rods are Q1 = + 30nC, Q2 = + 3.0 Q1 and Q3 = ?? 8.0 Q1 what is the net electric potential at the origin due to the rods?

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y (cm) 4.0 ) 2.0 1.0 * (cm)