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OpenStudy (anonymous):
Positive charge Q is uniformly distributed around a semi-circle of radius a. Find the electric field at the center of the curvature. Thanks for all the help!
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OpenStudy (goformit100):
@FoolForMath
OpenStudy (kainui):
|dw:1340303458453:dw| So we can try to think of the vectors now of this picture by looking at the symmetries.
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