Charge of uniform density (80 nC/m3) is distributed throughout a hollow cylindrical region formed by two coaxial cylindrical surfaces of radii 1.0 mm and 3.0 mm. Determine the magnitude of the electric field at a point which is 2.0 mm from the symmetry axis.
A. 7.9 N/C
B. 9.0 N/C
C. 5.9 N/C
D. 6.8 N/C
E. 18 N/C
Answer: D
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