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Originally posted in a non-homework forum, so the homework template is missing

**The question is based on the image below but is not the same. The question is as follows:**

Assume the capacitor is charged, so that there is a charge

*q*on the top plate and a charge

*-q*on the bottom plate. Determine the

**magnitude of the potential difference across the**answering in units of

*k2*region,*q*. *There is a typo in the book;

*k1*is the

*lower half*of the gap. Answer in units of 109 V/C (Volt per Coulomb because this factor is multiplied by

*q,*so the Coulomb cancels)

My attempt:

I used the parallel capacitor equation E = (Q / A) / 2(epsilon)(k) to find the electric fields for both plates. I added up the two fields and got -5.42*10^11 for the total electric field between the two plates. Then I used the equation E = V / d, plugging in my electric field and using 4.62 * 10^-3 for d and got a change in V of -1.25 * 10^9. I don't know where I went wrong can someone please help me find my mistake? Thanks.