A uniformly charged insulating rod of length 20.0 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 (in N/C) at 0, the center of the semicircle. 10.6e6 • N/C (b) Find the direction of the electric field at O, the center of the semicircle. to the left to the right upward downward into the page out of the page (e) What if? What would be the magnitude of the electric field (in N/C) at O if the top half of the semicircle carried a total charge of -7.50 µC and the bottom half, insulated from the top half, carried a total charge of +7.50 μC? x N/C 1.06e7 O O

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