Progressively larger radii a, 3. consider three coaxial cylinders of the inner and outer cylinders be perfect absorbers so that ρ(a) ρ(c) = 0 for all times. let the concentration at the cylinder of radius b be pm a source of food b, and c. let or of particles. show that, in general, the steady state (i. e. time independent) concentrations ρ(r) and ρ(t2) at the radi r1 and r2 respectively are related to where i is the current between them and is positive if the flow is outward, and negative if the flow is inward use this to calculate the current in from b to a and iout from b to c and from them obtain the probability that a particle will be absorbed at r = a. show that as c increases without limit, the probability approaches unity, albeit rather slowly. in this instance, two-dimensional diffusion is more like one-dimensional than th l diffusion.