A very long conducting cylindrical rod of length L = 40 m with a total charge q = 4.00×10-3 C is surrounded by a conducting cylindrical shell (also of length L and inner radius of 0.216 cm and outer radius of 0.400 cm) with total charge -2q, as shown in the section in the figure (Note that the central rod is exaggerated and the shell is much thicker than shown in the figure).

Use Gauss' law to find the electric field at points outside the conducting shell, and evaluate the field at r = 0.800 cm.

Find the electric field in the region between the shell and rod and evaluate the field at r = 0.108 cm


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