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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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Imagine a cube of edge a, enclosing the charge. The square surface is one of the six faces of this cube. Accoding to Gauss's theorem in electrosstatics, total electric flux through the cube `= Q//in_(0)`
`:.` Electric flux though the square surface `= (Q)/(6in_(0))`
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