Magnitude of Electric Field in Cell Membrane?

[rcmango]

[SOLVED] magnitude of electric field.

Homework Statement

The inner and outer surfaces of a cell membrane carry a negative and positive charge, respectively. Because of these charges, a potential difference of about 0.060 V exists across the membrane.

The thickness of the membrane is 9.00 x 10^-9 m. What is the magnitude of the electric field in the membrane?
in V/m


i believe the equation to be: E = V/r

not sure why .060 / 9.00 x 10^-9 would not work?

Homework Equations

The Attempt at a Solution

it says my answer of: 6.7E-6 is incorrect??

 

[G01]

You are dividing a number by a VERY small number. This means that your answer should be a very big number. 6.7E-6 is not very big. Check your math. I think you may have made an sign error with your exponent.

 

[rcmango]

Okay thanks, 6.7E6

 

[G01]

Anytime.