A capacitor is made up of two long coaxial cylindrical conductorsseparated by a vaccum. If the capacitance per unit length is 97.0 pF/m,the ratio of the radii of the outer cylinder and the inner cylinder is mostnearly

9:27 (23) O M D شهد قبل 5 دقائق Determine the equivalent capacitance (in mF units) of the combination shown when C= 49.7 mF. 2C

capacitor and take C = xe A/d and Q = CAV to investigate the charge as follows. Use typical values for a cylindrical axon of cell wall thickness d = 1.6 x 10-8 m, axon radius r = 2.0 x 10¹ μm, and cell-wall dielectric constant x = 2.2. Positive charge layer Negative { charge layer External fluid Axon wall membrane 1 O No O Internal fluid Axon radius = r + d Q (a) Calculate the positive charge on the outside of a 0.10-m piece of axon when it is not conducting an electric pulse. (Assume an initial potential difference of 7.0 x 10-2 v.) C How many K+ ions are on the outside of the axon assuming an initial potential difference of 7.0 x 10-2 V? K+ ions Is this a large charge per unit area? Hint: Calculate the charge per unit area in terms of electronic charge e per angstrom squared (A2). An atom has a cross section of about 1 A² (1 A = 10-10 m). (Compare to normal atomic spacing of one atom every few A.) Yes