(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

See figure attached.

2. Relevant equations

3. The attempt at a solution

See figure attached for the provided solution.

I got everything up to what I put in a red box.

Where does he get that negative from?

Did he do that with the intentions of reversing the limits on his integral?

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# Two-electrode spherical system (Potential)

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