Membrane Potential and Permittivity

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alex_b93
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Hi,
Was wondering if I could get some help with part b of this question?
I've attached the question and my attempt in the pictures as there was a lot of data and writing, so thought this would be the easiest way.

With my attempt I think I'm missing something pretty obvious, but I'm drawing a blank on it.

Cheers

Homework Statement



See pictures attached

Homework Equations



See pictures attached

The Attempt at a Solution



See pictures attached
 

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Can anyone help at all?