help finding the electric feild strength in a uniform E-field

1. The problem statement, all variables and given/known data

The voltage across a membrane forming a cell wall is 78.7 mV and the membrane is 8.52 nm thick. What is the electric field strength? (The value is surprisingly large, but correct.) You may assume a uniform E-field.

2. Relevant equations


3. The attempt at a solution

E=-(.00787V(8.52e-9m)) = 7.9e-11 V

i dont understand why this is wrong?

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