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An excess charge of +Q is distributed into two unequal parts, one having charge +q .

Assume that these two new charges are now separated by a non-zero distance. What value of q maximizes the repulsive electric force that one of these new charges exerts on the other?

I got so far that q and the other one is charged (Q-q) due to the repulsive force. I know I would need to take the derivative but this is where I got lost. Any help would be great! Thank you in advance!