What is the force F⃗ on the 1 nC charge at the bottom?

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Homework Statement



What is the force F on the 1.0 nC charge at the bottom in the figure? Give your answer in component form.
8678028c-cfa4-4d2e-ade8-9510d3233630.jpe


Homework Equations



F=q1q1/4piεr^2


The Attempt at a Solution



I got the answer 1*10^-5 N i, 2.2*10^-5 N j

however it keeps telling me Term 2: The correct answer does not depend on "j".

I tried removing j, still wrong. removed both i and j, still wrong.. i tried many things but still wrongg.
 
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