Here is a problem that I need explaining. It shows the explanation on how to fin

Question

Here is a problem that I need explaining. It shows the explanation on how to find the answer but I need someone to explain to me how they got the "I enclosed" to plug in the formula. I thought you only used what is enclosed in the Amperean loop at F, so why use C? Full steps would be great. Thank you!!

The figure below shows a straight cylindrical coaxial cable of radii a, b, and c in which equal, uniformly distributed, but antiparallel currents i exist in the two conductors. Which expression gives the magnitude of the magnetic field in the region r1

Explanation / Answer

because as we know that current never flow inside the conductor but it flows only on the very thin skin at the surface of the conductor, so it is necessary to include that region and it can be done only when you enclose the region at c.

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