Electric flux through the square

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Homework Statement


A point charge of +6μC is placed at a distance 20 cm directly above the center of a square of side 40cm.The magnitude of the flux through the square is

Homework Equations



Equation: Phi = Q / epsilon_0, electric flux equals charge divided by permittivity of free space.

The Attempt at a Solution


Diagram of a rectangle with a vertical line from its top edge to a point labelled +6μC, marked 20 cm, with the side labelled 40 cm.

Now how to enclose the charge completely?The answer is with the help of 5 more squares but I want to know how?Because this will make a cube
Wireframe cube drawn in perspective with a small red dot marking a point charge on its top face, illustrating how the charge sits at a corner of a cubic enclosure.

The charge is not enclosed completely.
 
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