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Consider a ring of charge. The ring is in the x-y plane and has a radius of 3.5 m. The charge per angle as a function of angle α (in radians) around the ring is given by
dQ/dα = 6.9 α (nC/rad).
Calculate the z-component of the electric field, in N/C, at the coordinate (0, 0, 9 m). Use k = 9 x 109 N m2 / C2.
(Please answer to the fourth decimal place - i.e 14.3225)
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