Pre-AP Electrostatics 4: Voltage

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Notes over potential difference and potential energy.
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Hello. I would just like to point out ... should not the r at point C for the positive 2 nanocoulomb charge be 3 m and not 4m ? I think you measured the distance between point A and point C and not the distance between the positive 2 nanocoulomb charge and point C, that is why there is an extra 1 meter and so you wrote 4 instead of 3. And also, 4.5 - 18 is not -3.5, BUT -13.5. That is all, thanks.

PauloSantos-iukl