 Quote by berkeman
Welcome to the PF!
This is the problem:
You cannot neglect it. You need to do the vector sum first, and then you can take the magnitude of the resultant vector.
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Hi, thanks for your response. I'm not sure where I can get the 3.69 value. The resultant vector is [tex]4l\hat{i}+4l\hat{j}+4l\hat{k}[/tex].
[tex]F = \frac{Q^2}{4\pi\epsilon_0R^2}\cdot\hat{a}[/tex]
Is R the magnitude of the resultant vector - it would be [tex]\sqrt{48l^2}[/tex]???
I think I'm getting confused.