The point charges \( -2 q,-2 q \), and \( +q \) are put on the vertices of an equilateral triang...

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The point charges \( -2 q,-2 q \), and \( +q \) are put on the vertices of an equilateral triangle of side \( a \). Find the work done by some external force in increasing the separation to \( 2 a \) (in joules).
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