The Cross Section of a Long Coaxial Cable Is Shown

Multiple Choice

The cross section of a long coaxial cable is shown in the figure, with radii as given. The linear charge density on the inner conductor is -40 nC/m and the linear charge density on the outer conductor is -50 nC/m. The inner and outer cylindrical surfaces are respectively denoted by A, B, C, and D, as shown. (ε0 = 8.85 × 10^-12 C²/N ∙ m²) The magnitude of the electric field at a point that is 94 mm from the axis is closest to

A) 17,000 N/C.
B) 15,000 N/C.
C) 13,000 N/C.
D) 11,000 N/C.
E) 9600 N/C.