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My question:

Two point charges, Q1=- microcolumbs and Q2= microcolumbs are seperated by a distance of 12cm. The electric field at the point P is zero. How far from Q1 is P?

I know that E=F/q, but I'm not sure if I equal this to zero. To figure out this problem, do I first devise a portion to help me find the answer??? Not sure

Thank You