(Answered) If the diffusion coefficient d and concentration c in

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If the diffusion coefficient D and concentration C in solution, the current I(L,a) of their diffusional encounters with a rod of length L and radius a is:

I(L,a) = -4πDLC / ln(2L/a)

For a long rod, L/a = 10^6, compute ratio of I(L,a) to I(a), the current to a sphere of radius a.

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