A long straight metal rod has a radius of 2.0 mm and a surface charge of density 0.40 nC/m2. Determine the magnitude of the electric field 3.0 mm from the axis.
A. 18 N/C
B. 23 N/C
C. 30 N/C
D. 15 N/C
E. 60 N/C
Answer: C
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