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**Voltage difference = Infinity?**

So if there was a Q Coulomb point charge and a -Q Coulomb point charge with X meters of separation, and I wanted to find the voltage difference between those two charges...

How would I do it?

Since V = kq/r + kq/r in this case, wouldn't I have to divide by 0?

V = Qk/X + -Qk/0

Or to avoid the problem, I just made it REALLY close to the charge, like:

V = Qk/X + -Qk/.0000001

Then I'd get some obscenely large number for the voltage for BOTH sides... But I know I'm missing something pretty major here. The potential difference shouldn't be that huge.

The reason I want to know is because I'd like to know how to calculate a battery's voltage by knowing just the charges without using capacitor equations.

But I really can't figure this one thing out...