The axis of a long hollow metallic cylinder (inner radius = 1.0 cm, outer radius = 2.0 cm) coincides with a long wire. The wire has a linear charge density of ?8.0 pC/m, and the cylinder has a net charge per unit length of ?4.0 pC/m. Determine the magnitude of the electric field 3.0 cm from the axis.
A. 5.4 N/C
B. 7.2 N/C
C. 4.3 N/C
D. 3.6 N/C
E. 2.4 N/C
Answer: B
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