A long nonconducting cylinder (radius = 6.0 mm) has a nonuniform volume charge density given by ?r2, where ? = 6.2 mC/m5 and r is the distance from the axis of the cylinder. What is the magnitude of the electric field at a point 2.0 mm from the axis?
A. 1.4 N/C
B. 1.6 N/C
C. 1.8 N/C
D. 2.0 N/C
E. 5.4 N/C
Answer: A
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