Let's denote the charges as \( q_1 \), \( q_2 \), and \( q_3 \). Assume they are placed at the corners of a square with side length \( a \). For simplicity, place \( q_1 \) at the bottom-left corner, \( q_2 \) at the bottom-right corner, and \( q_3 \) at the
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