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Figure shows three point charges + 2q ,-...

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

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`q_(net)=2q-q=q implies phi (q_(net))/e_0=e/E_0`
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