Consider a portion of a cell membrane that has a thickness of 7.50 nm and 1.8 pm x 1.8 pm in area. A measurement of the potential difference across the inner and outer surfaces of the membrane gives a reading of 91.5 mv. The resistivity of the membrane material is 1.30 x 107n - m. (a) Determine the amount of current that flows through this portion of the membrane. (b) By what factor does the current change if the side dimensions of the membrane portion is halved? The other values do not change. O increase by a factor of 4 O decrease by a factor of 4 O increase by a factor of 2 O decrease by a factor of 8 O decrease by a factor of 2

Consider a portion of a cell membrane that has a thickness of 7.50 nm and 1.8 pm x 1.8 pm in area. A measurement of the potential difference across the inner and outer surfaces of the membrane gives a reading of 91.5 mv. The resistivity of the membrane material is 1.30 x 107n - m. (a) Determine the amount of current that flows through this portion of the membrane. (b) By what factor does the current change if the side dimensions of the membrane portion is halved? The other values do not change. O increase by a factor of 4 O decrease by a factor of 4 O increase by a factor of 2 O decrease by a factor of 8 O decrease by a factor of 2

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Resistivity

Resistivity is a characteristic property of the conductor’s material that measures the extent to which the material opposes the flow of current. It is denoted by the Greek letter “rho”. Electrical resistivity, also known as specific resistance, depends on the nature of the material of the conductor and is unaffected by its dimensions.

Question

Consider a portion of a cell membrane that has a thickness of 7.50 nm and 1.8 pm x 1.8 um in area. A measurement of the potential difference across the inner and outer surfaces of the membrane gives a reading of 91.5 mV. The resistivity of the membrane material is 1.30 x 107n - m.
(a) Determine the amount of current that flows through this portion of the membrane.
(b) By what factor does the current change if the side dimensions of the membrane portion is halved? The other values do not change.
O increase by a factor of 4
O decrease by a factor of 4
O increase by a factor of 2
o decrease by a factor of 8
O decrease by a factor of 2

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