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A thin plastic rod is bent into a semicircle of radius R centered at the origin. A charge - Qis
uniformly distributed along the right half of the semicircle, while a charge of +Q is uniformly
distributed along the left half of the semicircle, as shown in the figure.
^Y
+Q
R
-Q
X
Determine the net electric field at the origin due to the entire semicircle. Your answer must be
a vector.

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