What Is the Potential Difference in Biological Membranes and Electric Fields?

[pillar]

1a. The electric field within the membrane separating the inside and outside of a biological cell is approximately 8.1 {MV/m} and is essentially uniform.If the membrane is 13 nm thick, what is the potential difference across the membrane?
Express your answer using two significant figures



1b. Relevant equations

V=E*R

1c. The attempt at a solution
(8.1MV/m)(13nm)=80mv


2a.It takes 70 J to move a 10 mC charge from point A to point B.What's the potential difference Delta V {AB}?
Express your answer using two significant figures.

2b.k=e(delta V)

2c.70/(10*10^-6)

 

[member38644]

= 7*10^6 N/C

2d. Delta V = 7 V

1a. The potential difference across the membrane is approximately 80 mV.

2a. The potential difference between points A and B is approximately 7 V.