(a) Calculate the capacitance per unit length of an axon of radius 5.0 m (Fig. 17.14)....

(a) Calculate the capacitance per unit length of an axon of radius 5.0 μ m (Fig. 17.14). The membrane acts as an insulator between the conducting fluids inside and outside the neuron. The membrane is 6.0 nm thick and has a dielectric constant of 7.0.
(b) In its resting state (no signal being transmitted), the potential of the fluid inside is about 85 mV lower than the outside. Therefore, there must be small net charges ± Q on either side of the membrane. Which side has positive charge? What is the magnitude of the charge density on the surfaces of the membrane?