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Unformatted text preview: 19.52. • BIO Nerve cells are long, thin cylinders along which electrical disturbances (nerve impulses) travel. The cell membrane of a typical nerve cell consists of an inner and an outer wall separated by a distance of 0.10 μ μ . The electric field within the cell membrane is 7.0 ? 10 5 Ν / Χ. Approximating the cell membrane as a parallel-plate capacitor, determine the magnitude of the charge density on the inner and outer cell walls. 19.55. ••• A thin wire of infinite extent has a charge per unit length of λ . Using the cylindrical Gaussian surface shown in Figure 19–34 , show that the electric field produced by this wire at a radial distance r has a magnitude given by E = λ 2 πε ρ 20.13. •• I P BIO Living cells actively “pump” positive sodium ions Na + ( 29 from inside the cell to outside the cell. This process is referred to as pumping because work must be done on the ions tooutside the cell....
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This note was uploaded on 05/02/2008 for the course PHYS 107 taught by Professor Chen during the Spring '07 term at Ill. Chicago.
- Spring '07