1. The problem statement, all variables and given/known data Two coaxial cylindrical conductors are shown in perspective and cross-section above. The inner cylinder has radius a = 2.0 cm, length L = 10.0 m and carries a total charge of Qinner = + 8.0 nC (1 nC = 10-9 C). The outer cylinder has an inner radius b = 6.0 cm, outer radius c = 7.0 cm, length L = 10.0 m and carries a total charge of Qouter = - 16.0 nC (1 nC = 10-9 C). What is Ex, the x-component of the electric field at point P which is located at the midpoint of the length of the cylinders at a distance r = 4.0 cm from the origin and makes an angle of 30.0o with the x-axis? https://www.smartphysics.com/Content/Media/Images/EM/IE/cylinderx/coaxial.gif [Broken] 2. Relevant equations E A= q(enclosed)/[itex]\epsilon[/itex] 3. The attempt at a solution I simply treated the enclosed charge as +8nC, but i've seen ppl using linear charge density and yet they still got the answer. Is just just fluke luck that i got the answer? This is an online hmwk grading system btw.