A cylindrical cell of radius a is immersed in a cylindrical trough so that the external solution is cylindrical with radius b as shown in Figure P3. The resistivities of the cytoplasm and the extracellular solutions are pi and po, respectively. a) Find the relation between b and a for the condition r = ro b) Suppose that r = ro and pi - Po. Find the value of b for a 500 and for a = 1m = - Outer conductor Inner conductor Outer conductor Figure P3: Relation between external and internal resistance per unit length