11. Two uniform rods, each of length 2.0 m, are bent to form semicircles. One rod has a charge per unit length of 1.5 nC/m, and the other has a charge per unit length of −1.5 nC/m. The semicircles are joined to make a circle. What is the magnitude of the electric field at the center of the circle?
(A) 42 N/C
(B) 84 N/C
(C) 34 N/C
(D) 8 N/C
(E) 0 N/C

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