44. A long, straight coaxial cable consists of two thin, tubular conductors, the inner of radius a and the outer radius b. Current I flows out along one conductor and back along the other. What is the self-inductance per unit length of the cable? (μ0 is the magnetic constant.)
(A)
(B)
(C)
(D)
(E)

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統計： A(0), B(0), C(2), D(0), E(0) #3840154