Figure shows three point charges, \( +2 q,-q \) and \( +3 q \). Two...

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Figure shows three point charges, \( +2 q,-q \) and \( +3 q \). Two charges \( +2 q \) and \( -q \) are enclosed within a surface \( S \). What is the electric flux due to this configuration through the surface \( S \) ?
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