I have the following formula on my formula sheet:(adsbygoogle = window.adsbygoogle || []).push({});

ΔU = U_a - U_b = q(V_a - V_b)

I was wondering if 'a' is final and 'b' is initial or is it the other way around? Also when I plug in my charge q into the formula, if it was a negative charge do I plug the negative sign into the formula? I realize that some formulas assume that you plug in the magnitude of the charge so I am not so sure about this formula... Thanks!

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# Change in potential energy/work formula for electric charges.

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