POTENTIAL DIFFERENCE AND ELECTRIC FIELD HOMEWORK

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tuyenb
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Homework Statement
What is the magnitude of the average electric field inside the battery? Your answer should be in SI units.
Relevant Equations
See first picture please
I tried following the formula but it wasn’t correct. I’m sure I could get it if I had an example as I’m sure this must be a simple question for other people I was just unsure if I was doing it correct.
 

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