Consider a myelinated fiber in which th nodes of Ranvier are spaced every 2mm. The resistance of the axoplasm per unit length is r(initial) = 1.4x10^10 omega/m. The nodal capacitance is about 1.5x10^-12 F. (a) if the voltage difference between nodes is 10 mV, what is the current along the axon? Assume that the voltages are not changing with time, so that the membrane charge does not change. also neglect leakage current through the membrane. (b) if the nerve impulse rises from -70 mV to +30mV in 0.5 ms, what is the average current required to charge the nodal capacitance?