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Generally I would type out the question myself rather than just screenshotting it but since I'm on my phone I elected to simply attach pictures of both the question and my work.

Part a and b I was able to do, but what I'm having a hard time with is part c. I know how to find the electric force between 2 charges, but I'm lost as to how I'm supposed to incorporate the third charge. I feel like I should be using some of the values I already calculated but I just don't know where to start on part c.

Part a and b I was able to do, but what I'm having a hard time with is part c. I know how to find the electric force between 2 charges, but I'm lost as to how I'm supposed to incorporate the third charge. I feel like I should be using some of the values I already calculated but I just don't know where to start on part c.