Resistance in a coaxial cable of length L

1. The problem statement, all variables and given/known data
Determine the insulation resistance in a coaxial cable of length L, with conductivity, as shown in Figure assume that the current density J is radial direction.

3. The attempt at a solution

so i was wondering if this approach is correct,

consider a sequence of cylindrical shells of radius r and thickness dr. Each shell has a resistance dR given by:

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