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A charge Q is placed at a distance a//...

A charge Q is placed at a distance `a//2` above the centre of the square surface of edge a as shown in the figure

The electric flux through the square surface is :

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We can consider imaginary faces of cube such that the charge lies at the centre of the cube. Due to symmetry, we can say that flux through the given area (which is one face of cube), `phi=Q/(6 epsi_(0))`
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