An array of four charges is arranged along the x -axis at intervals of 1.0 m.
(a) If two of the charges are + 1.0μC and two are ˆ’ 1.0μC, draw a configuration of these charges that minimizes the potential at x = 0.
(b) If three of the charges are the same, q = + 1.0μC, and the charge at the far right is ˆ’ 1.0μC, what is the potential at the origin?

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F1.0 m-1.0 m-1.0 m- 1.0 m+1.0