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The figure shows three circular arcs centered at the origin of a coordinate system. On each arc, the uniformly distributed charge is
given in terms of Q = 3.97 µC. The radii are given in terms of R = 8.31 cm. What are the (a) magnitude and (b) direction (relative to the
positive x direction) of the net electric field at the origin due to the arcs?
3R
+9Q
-4Q
2R
+Q
R
(a) Number
i
Units
(b) Number
i
Units

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