Each 2.0-m length of a long cylinder (radius = 4.0 mm) has a charge of 4.0 nC distributed uniformly throughout its volume. What is the magnitude of the electric field at a point 5.0 mm from the axis of the cylinder?
A. 9.9 kN/C
B. 8.1 kN/C
C. 9.0 kN/C
D. 7.2 kN/C
E. 18 kN/C
Answer: D
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