Charge of uniform density (20 nC/m2) is distributed over a cylindrical surface (radius = 1.0 cm), and a second coaxial surface (radius = 3.0 cm) carries a uniform charge density of ?12 nC/m2. Determine the magnitude of the electric field at a point 2.0 cm from the symmetry axis of the two surfaces.
A. 2.3 kN/C
B. 1.1 kN/C
C. 1.7 kN/C
D. 3.4 kN/C
E. 4.5 kN/C
Answer: B
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