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A uniformly charged insulating rod of length 18.0 cm is bent into the shape of a...

A uniformly charged insulating rod of length 18.0 cm is bent into the shape of a semicircle as shown in the figure below. The rod has a total charge of −7.50 µC.

(a) Find the magnitude of the electric field at O, the center of the semicircle.

(b) Find the direction of the electric field at O, the center of the semicircle.

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