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

A charge Q is placed at a distance `alpha/2` above the centre of a horizontal, square surface of edge a as shown in figure (30-E1). Find the flux of the electric field through the square surface.

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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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