Determine the average magnitude of the E^rightarrow field across a body cell mem

Question

Determine the average magnitude of the E^rightarrow field across a body cell membrane. A 0.10-V potential difference exists from one side to the other and the membrane is 7.1 times 10^-9 m thick. Assume that the dielectric constant is 1.0 (it is actually somewhat larger). Express your answer to two significant figures and include the appropriate units. Determine the magnitude of the electrical force on a sodium ion (charge +e) in the membrane. Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

electric field = voltage difference / thinkness

E = 0.1/(7.1*10^(-9)) = 14.08*10^6 V/m

F = q*E

F = 1.6*10^(-19)*14.08*10^6 = 2.25*10^(-12) N

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