Imagine four equal positive charges, q, placed on points of a circle of radius r at the 3, 6, 9, and 12 o'clock positions. Coulomb's constant is k. The magnitude of the electric field at the center of the circle is given by
A. 4 kq/r.
B. 4 kq/r2.
C. kq/r2.
D. kq/r.
E. zero.
Answer: E
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