Charge of Uniform Density (20 NC/m²) Is Distributed Over a Cylindrical

Multiple Choice

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 4.0 cm from the symmetry axis of the two surfaces.

A) 0.45 kN/C
B) 1.0 kN/C
C) 0.73 kN/C
D) 0.56 kN/C
E) 2.3 kN/C