A uniformly charged insulating rod of length
14cm is bent into the shape of a semicircle as in the figure.
If the rod has a total charge of
−8.55μC, find the horizontal component of the electric field at O, the center of the semicircle. Define right as positive. The value of the Coulomb constant is
8.98755×109N.m2/C2.
Answer in units of N/C.