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

Figure shown three point charges , `+2q,-q,-qand+3q`. Two charges +2q 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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Electric flux, `phi=(2q-q)/(epsilon_(0))`
`phi=(q)/(epsilon_(0))`
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