Two uniform rods, each of length 2.0 m, are bent to form semicircles. One rod has a charger per unit lent 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. 68 N/C
E. 0
Answer: B
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