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duhduhduh
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What are the coordinates of Q1 and Q2? Are you sure you have the correct sign for the x-component of the force?
 
Q1 is up and to the left of Q2. Oh, so force must be negative since it's Q2 acting on Q1?
 
duhduhduh said:
Oh, so force must be negative since it's Q2 acting on Q1?
Yep.
 
duhduhduh said:
Solved.

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