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3 charges each have charge +Q and are located on x axis at (-3a,0), (0,0) and...

3 charges each have charge +Q and are located on x axis at (-3a,0), (0,0) and (3a,0). Find the net electric field vector and electric potential at (0, 4a).
say the vector components of the net electric field at (0,4a), the electric potential at (0,4a), and the net force on the charge at (0,0).
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