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
and the linear charge density on the outer conductor is
The inner and outer cylindrical surfaces are respectively denoted by A, B, C, and D, as shown.
The magnitude of the electric field at a point that is
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.
Correct Answer:
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