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1. The problem statement, all variables and given/known data

What is the electric field at a point midway between a -8.64uC and 6.97uC charge 7.63 cm apart? Take the direction towards the positive charge to be positive and assume no other charges nearby.

2. Relevant equations

E=kQ/r^{2}

3. The attempt at a solution

So what I've been doing is finding the strengths of the electric fields for each charge at the midpoint, which is .03185 m, and then adding them together.

e.g. E_{1}=k(6.97*10^{-6})/(.03185^{2})

E_{2}=k(-8.64*10^{-6})/(.03185^{2})

I get -1.48*10^{7}, when the answer ought to be -9.56*10^{7}

What am I doing wrong?

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# Homework Help: The electric field at a midpoint of two charges

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