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Show three points charges +2q. -q and +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_in =(1)/( in_0) sum ` (charged enclosed within surface)
` " " =(1)/( in_0) [2q-q] =+(q)/(in_0) `
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