A flux through a cubic Gaussian surface with enclosed charge q is Φ. If the extra charge 2q is put at outside of the cub the new flux will be
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According to Gauss's law, the electric flux, ϕ=
ϵ
0
Q
enclosed
Here the charge enclosed inside the cube is Q
enclosed
=Q
thus, ϕ=
ϵ
0
Q
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