A rod (length = 2.0 m) is uniformly charged and has a total charge of 40 nC. What is the magnitude of the electric field at a point which lies along the axis of the rod and is 3.0 m from the center of the rod?
A. 40 N/C
B. 45 N/C
C. 24 N/C
D. 90 N/C
E. 36 N/C
Answer: B
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