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# Zero Potential of Two Charges on a Line: Positive Coordinate

EANDM-WKNYUD

Two charges, one having a charge of $+q$ and the other having a charge of $-3q$ are arrayed along the $\hat{x}$ axis as shown in figure 1​. The positive charge is located at the point $x = 0$ and the negative charge is located at the point $a = 4.0 \text{ cm}$.