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A charge Q is placed at a distance a/2 a...

A charge Q is placed at a distance `a/2` above the centre of a horizontal, spuare 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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Once again the procedure of the question will be to cover the charge Q symmetrically and completely. So, if we have five more square plates of identical size then we can make a hollow cube and we will find that the charge Q is placed at the centre.
Now, can you see that the total flux of Q is being shared by six faces equally and we are supposed to calculate it for the lower plate! So, the answer will be `Q//6epsilon_(0)`.
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