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**different answer from teacher's.....**

Okay, here's what the question says in my book: The electric field midway between two equal but opposite point charges is 1750 N/C, and the distance between the charges is 16.0 cm. What is the magnitude of the charge on each?

I found what the force would be equal to and put it in place of F in E=F/q. When I worked it out I got 4.98 x 10^-9 C but the answer my teacher gave us was 6.2 x 10^-10 C. So am I not getting it or did he give the wrong answer? Any help would be much appreciated, thanks!