POTENTIAL DIFFERENCE AND ELECTRIC FIELD HOMEWORK

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The discussion revolves around confusion regarding the application of formulas related to potential difference and electric fields in homework. The user expresses difficulty in solving a problem and believes an example would clarify their misunderstanding. They are uncertain about their calculations and seek confirmation on the correct approach. The forum encourages users to share their attempts to facilitate better assistance. Providing an example could enhance understanding of the concepts involved.
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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tuyenb said:
I tried following the formula but it wasn’t correct.
Per forum rules, please post your attempt.
 
If have close pipe system with water inside pressurized at P1= 200 000Pa absolute, density 1000kg/m3, wider pipe diameter=2cm, contraction pipe diameter=1.49cm, that is contraction area ratio A1/A2=1.8 a) If water is stationary(pump OFF) and if I drill a hole anywhere at pipe, water will leak out, because pressure(200kPa) inside is higher than atmospheric pressure (101 325Pa). b)If I turn on pump and water start flowing with with v1=10m/s in A1 wider section, from Bernoulli equation I...

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